Vitzthum, V. J., Spielvogel, H., & Thornburg, J. (2004). Interpopulational differences in progesterone levels during conception and implantation in humans. National Academy of Sciences.
استشهاد بنمط شيكاغوVitzthum, Virginia J., Hilde Spielvogel, و Jonathan Thornburg. Interpopulational Differences in Progesterone Levels During Conception and Implantation in Humans. National Academy of Sciences, 2004.
MLA استشهادVitzthum, Virginia J., Hilde Spielvogel, و Jonathan Thornburg. Interpopulational Differences in Progesterone Levels During Conception and Implantation in Humans. National Academy of Sciences, 2004.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.