Gaya APA

Cunningham, F, G. et al (2018). WILLIAMS OBSTETRICS 25TH EDITION (Buku 2). United states of America: McGraw-Hill Higher Education.

Gaya MLA

Cunningham, F., Gary. et al. "WILLIAMS OBSTETRICS 25TH EDITION". Buku 2 United states of America: McGraw-Hill Higher Education, 2018. Text.