Cita APA (7th ed.)
Christensen, T. G. (1990). An African tree of life. Orbis Books.
Cita Chicago (17th ed.)
Christensen, Thomas G. An African Tree of Life. Maryknoll, N.Y.: Orbis Books, 1990.
Cita MLA (9th ed.)
Christensen, Thomas G. An African Tree of Life. Orbis Books, 1990.
Atenció: Aquestes cites poden no estar 100% correctes.