Παραπομπή APA

Strong, S., & Corney, G. (1967). Placenta in twin pregnancy.

Παραπομπή Chicago Style

Strong, Sj, και G. Corney. Placenta in Twin Pregnancy. 1967.

Παραπομπή MLA

Strong, Sj, και G. Corney. Placenta in Twin Pregnancy. 1967.