APA (7th ed.) Citation

Marble, D. F. (1967). Some computer programs for geographic research. Northwestern University, Department of Geography.

Chicago Style (17th ed.) Citation

Marble, Duane Francis. Some Computer Programs for Geographic Research. Evanston, Ill.: Northwestern University, Department of Geography, 1967.

MLA (9th ed.) Citation

Marble, Duane Francis. Some Computer Programs for Geographic Research. Northwestern University, Department of Geography, 1967.