Gaya APA

Berstein, R., Stephen, B. (1989). Schaum's 3000 solved problems in biology.(Schaum solved problems series) . New York: McGraw-Hill.

Gaya MLA

Berstein, Ruth., Stephen, Berstein. "Schaum's 3000 solved problems in biology.(Schaum solved problems series)". New York: McGraw-Hill, 1989. Text.