Gaya APA

Johnson, W, H., S., I, D, L. (). Essentials of biology . New: New York: Holt, Rinehart and Winston; 1969.

Gaya MLA

Johnson, Willis, H.., S., I., Delanney,, Louis. "Essentials of biology". New: New York: Holt, Rinehart and Winston; 1969, . Text.