APA (7th ed.) Citation

Porter, O. F. (1990). Undergraduate completion and persistence at four-year colleges and universities: Detailed findings. National Institute of Independent Colleges and Universities.

Chicago Style (17th ed.) Citation

Porter, Oscar F. Undergraduate Completion and Persistence at Four-year Colleges and Universities: Detailed Findings. Washington, DC: National Institute of Independent Colleges and Universities, 1990.

MLA (9th ed.) Citation

Porter, Oscar F. Undergraduate Completion and Persistence at Four-year Colleges and Universities: Detailed Findings. National Institute of Independent Colleges and Universities, 1990.