Cita APA (7th ed.)

Heimler, C. H., & Lockard, J. D. (1981). Focus on life science. Merrill.

Cita Chicago (17th ed.)

Heimler, Cahrles H., i J. David Lockard. Focus on Life Science. Columbus, OH: Merrill, 1981.

Cita MLA (9th ed.)

Heimler, Cahrles H., i J. David Lockard. Focus on Life Science. Merrill, 1981.