COTTLER, J. (1966). Alfred Wallace: Explorer - naturalist. Little, Brown.
Cita Chicago (17th ed.)COTTLER, Joseph. Alfred Wallace: Explorer - Naturalist. Little, Brown, 1966.
Cita MLA (9th ed.)COTTLER, Joseph. Alfred Wallace: Explorer - Naturalist. Little, Brown, 1966.
Atenció: Aquestes cites poden no estar 100% correctes.