Swan, S. H., & Colino, S. (2021). Count down: How our modern world is threatening sperm counts, altering male and female reproductive development, and imperiling the future of the human race (First Scribner hardcover edition.). Scribner.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Swan, Shanna H., و Stacey Colino. Count Down: How Our Modern World Is Threatening Sperm Counts, Altering Male and Female Reproductive Development, and Imperiling the Future of the Human Race. First Scribner hardcover edition. New York: Scribner, 2021.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Swan, Shanna H., و Stacey Colino. Count Down: How Our Modern World Is Threatening Sperm Counts, Altering Male and Female Reproductive Development, and Imperiling the Future of the Human Race. First Scribner hardcover edition. Scribner, 2021.