• Bigelow, J. L., Dunson, D. B., Stanford, J. B., Ecochard, R., Gnoth, C., Colombo B. (2004) "Mucus observations in the fertile window: a better predictor of conception than timing of intercourse." Human Reproduction 19: 889-892.
     
  • Colombo, B., Mion, A., Passarin, K., Scarpa, B. (2006) "Cervical mucus symptom and daily fecundability: first results from a new database." Statistical Methods in Medical Research 15: 161-180. 
     
  • Evens-Hoeker, E., Pritchard, D. A., Long, D. L., Herring, A. H., Stanford, J. B., Steiner, A. Z. (2013) "Cervical mucus monitoring prevalence and associated fecundability in women trying to conceive." Fertility and Sterility 100: 1033-1038. 
     
  • Fehring, R., Schneider, M. (2014) "Comparison of Abstinence and Coital Frequency between Two Natural Methods of Family Planning." Journal of Midwifery and Women’s Health Pending Publication.
     
  • Gnoth, C., Godehardt, D., Godehardt, E., et al.  (2003) "Time to pregnancy: results of the German prospective study and impact on the management of infertility." Human Reproduction 18: 1959-1966.
     
  • Keulers, M. J., Hamilton, C. J. C. M., Franx, A., Evers, J. L. H., Bots, R. S. G. M. (2007) "The length of the fertile window is associated with the chance of spontaneously conceiving an ongoing pregnancy in subfertile couples." Human Reproduction 22: 1652-1656. 
     
  • Lynch, C. D., Sundaram, R., Maisung, J. M., Sweeney, A. M., Buck Louis, G. M. (2014) "Preconception stress increases the risk of infertility: results from a couple-based prospective cohort study – the LIFE study." Human Reproduction. Advanced Access: 1-9.
     
  • Martinez, A.R., Bernardus, R.E., Vermeiden, J.P., & Schoemaker, J. (1992) "Reliability of home urinary LH tests for timing of insemination: A consumer's study." Human Reproduction 7: 751-753.
     
  • Mu, Q. and Fehring, R. (2014) "Efficacy of achieving pregnancy with fertility focused intercourse." MCN The American Journal of Maternal Child Nursing 39: 35-40.
     
  • Robinson, J. E., Ellis, J. E. (2007) "Increased pregnancy rate with use of the Clearblue Easy Fertility Monitor." Fertility and Sterility 87: 329- 234.
     
  • Scarpa, B., Dunson, D. B. (2007) "Bayesian methods for searching for optimal rules for timing intercourse to achieve pregnancy." Statistics In Medicine 26: 1920-1936.
     
  • Sinai, I., Arevalo M. (2006) "It’s all in the timing: coital frequency and fertility awareness-based methods of family planning." Journal of Biosocial Science 38: 763-777.
     
  • Snick, H. K. A. Should spontaneous or timed intercourse guide couples trying to conceive? Human Reproduction 10 (2005): 2976-2977.
     
  • Snick, H. K., Collins, J. A., Evers, J. L. H. (2008) "What is the most valid comparison treatment in trials of intrauterine insemination, times or uninfluenced intercourse? A systematic review and meta-analysis of indirect evidence." Human Reproduction 23: 239-2245.
     
  • Stanford, J. B., White, G. L., and Hatasaka, H. (2002) "Timing intercourse to achieve pregnancy: current evidence." Obstetrics & Gynecology 100: 1333-1341.
     
  • Stirnemann, J. J., Samson, A., Bernard, J. P., Thalabard, J. C. (2013) "Day-specific probabilities of conception in fertile cycles resulting in spontaneous pregnancies." Human Reproduction 28: 1110-1116. 
     
  • Tiplady, S., Jones, G., Campbell, M. et al., (2013) "Home ovulation tests and stress in women trying to conceive: a randomized controlled trial." Human Reproduction 28: 138-151.
     
  • Wilcox, A.J., Weinberg, C.R., & Baird, D.D. (1995) Timing of sexual intercourse in relation to ovulation. Effects on the probability of conception, survival of the pregnancy, and sex of the baby. The New England Journal of Medicine 333: 1517-1521.

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