APA (7th ed.) Citation

Harper, D. E. (1966). Donald E. Harper, Jr., Ph.D. research files.

Chicago Style (17th ed.) Citation

Harper, Donald E. Donald E. Harper, Jr., Ph.D. Research Files. 1966.

MLA (9th ed.) Citation

Harper, Donald E. Donald E. Harper, Jr., Ph.D. Research Files. 1966.

Warning: These citations may not always be 100% accurate.