Cita APA (7a ed.)

Seward,A.C. (1966). Plant life through the ages: A geological and botanical retrospect. Hafner.

Cita Chicago Style (17a ed.)

Seward,A.C. Plant Life Through the Ages: A Geological and Botanical Retrospect. New York - EEUU: Hafner, 1966.

Cita MLA (8a ed.)

Seward,A.C. Plant Life Through the Ages: A Geological and Botanical Retrospect. Hafner, 1966.