Παραπομπή σε μορφή APA (7η εκδ.)

Hopwood, M., Mabry, J. C., & Sibley, W. L. (1980). The role of general clinical research centers in clinical trials: A characterization with recommendations. Rand Corp..

Παραπομπή σε μορφή Chicago (17η εκδ.)

Hopwood, Marsha, John C. Mabry, και W. L. Sibley. The Role of General Clinical Research Centers in Clinical Trials: A Characterization with Recommendations. Santa Monica, CA: Rand Corp., 1980.

Παραπομπή σε μορφή MLA (8th εκδ.)

Hopwood, Marsha, et al. The Role of General Clinical Research Centers in Clinical Trials: A Characterization with Recommendations. Rand Corp., 1980.