APA引文

Macmahon, B., & Pugh, T. F. (1953). Influence of Birth Order and Maternal Age on the Human Sex Ratio at Birth.

Citação norma Chicago

Macmahon, Brian, and Thomas F. Pugh. Influence of Birth Order and Maternal Age On the Human Sex Ratio At Birth. 1953.

MLA引文

Macmahon, Brian, and Thomas F. Pugh. Influence of Birth Order and Maternal Age On the Human Sex Ratio At Birth. 1953.

警告：這些引文格式不一定是100％准確.