Cita APA (7th ed.)

Tappan, H. (1980). The Paleobiology of plant protists. Freeman.

Cita Chicago (17th ed.)

Tappan, Helen. The Paleobiology of Plant Protists. San Francisco: Freeman, 1980.

Cita MLA (9th ed.)

Tappan, Helen. The Paleobiology of Plant Protists. Freeman, 1980.