APA (7th ed.) Citation

Gregory, R. L. (1971). The intelligent eye. McGraw-Hill Book Co.

Chicago Style (17th ed.) Citation

Gregory, Richard Langton. The Intelligent Eye. New York: McGraw-Hill Book Co, 1971.

MLA (9th ed.) Citation

Gregory, Richard Langton. The Intelligent Eye. McGraw-Hill Book Co, 1971.