Παραπομπή σε μορφή APA (7η εκδ.)

Van Zyl, D. J. A., Koval, M., & Li, T. M. (1992). Risk assessment: Management issues in the environmental planning of mines. Society for Mining, Metallurgy, and Exploration.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Van Zyl, Dirk J. A., Marshal Koval, και Ta M. Li. Risk Assessment: Management Issues in the Environmental Planning of Mines. Littleton: Society for Mining, Metallurgy, and Exploration, 1992.

Παραπομπή σε μορφή MLA (8th εκδ.)

Van Zyl, Dirk J. A., et al. Risk Assessment: Management Issues in the Environmental Planning of Mines. Society for Mining, Metallurgy, and Exploration, 1992.