Gaya APA

Bogdan, R, C., Biklen, S, K. (1998). Qualitative Research in Education (Ed. 3). Singapore: Allyn & Bacon.

Gaya MLA

Bogdan, Robert, C.., Biklen, Sari, Knopp. "Qualitative Research in Education". Ed. 3 Singapore: Allyn & Bacon, 1998. Buku PPS Pend. Biologi.