Cita APA (7a ed.)

Froman, R. (1972). Venn diagrams. Thomas Y. Crowell.

Cita Chicago Style (17a ed.)

Froman, Robert. Venn Diagrams. New York: Thomas Y. Crowell, 1972.

Cita MLA (9a ed.)

Froman, Robert. Venn Diagrams. Thomas Y. Crowell, 1972.