Cita APA (7a ed.)

Christensen, T. G., & Caemmerer, R. R. (1990). An African tree of life. Orbis Books.

Cita Chicago Style (17a ed.)

Christensen, Thomas G., y Richard R. Caemmerer. An African Tree of Life. Maryknoll [New York]: Orbis Books, 1990.

Cita MLA (9a ed.)

Christensen, Thomas G., y Richard R. Caemmerer. An African Tree of Life. Orbis Books, 1990.