APA

NACHTIGAL G., FISHER A. G. & FISHER H. J. (1980). Sahara and Sudan. London: Hurst & Company.

Chicago

NACHTIGAL Gustave, FISHER Allan G.B and FISHER Humphrey J. 1980. Sahara and Sudan. London: Hurst & Company.

Harvard

NACHTIGAL G., FISHER A. G. and FISHER H. J. (1980). Sahara and Sudan. London: Hurst & Company.

MLA

NACHTIGAL Gustave, FISHER Allan G.B and FISHER Humphrey J. Sahara and Sudan. London: Hurst & Company. 1980.