APA

Broek J. O. M., Webb J. W., . (1968). A geography of mankind. New York [etc.]: McGraw-Hill Book Co.

Chicago

Broek Jan Otto Marius, Webb John William, . 1968. A geography of mankind. New York [etc.]: McGraw-Hill Book Co.

Harvard

Broek J. O. M., Webb J. W., . (1968). A geography of mankind. New York [etc.]: McGraw-Hill Book Co.

MLA

Broek Jan Otto Marius, Webb John William, . A geography of mankind. New York [etc.]: McGraw-Hill Book Co. 1968.