Gaya APA

al., E. et al (1987,2009,2020). Biokimia Harper (Ed. 24,Ed. 27,Ed. 31). Jakarta: EGC.

Gaya MLA

al., Et. et al. "Biokimia Harper". Ed. 24,Ed. 27,Ed. 31 Jakarta: EGC, 1987,2009,2020. Text.