Gaya APA

Hall, R, P., Swanson, C, P. (1964). **Protozoa the simplest of all animals . New York: New York: Holt, Rinehart and Winston; 1964..

Gaya MLA

Hall, Richard, P.., Swanson, Carl, P.. "**Protozoa the simplest of all animals". New York: New York: Holt, Rinehart and Winston; 1964., 1964. Text.