Carl Waldman. (1992). Who was who in world exploration. New York: Facts on File.
Trích dẫn kiểu ChicagoCarl Waldman. Who Was Who in World Exploration. New York: Facts on File, 1992.
Trích dẫn MLACarl Waldman. Who Was Who in World Exploration. New York: Facts on File, 1992.
Cảnh báo: Các trích dẫn này có thể không phải lúc nào cũng chính xác 100%.