Keyes Jr, C. G., Bomar, G. W., DeFelice, T. P., Griffith, D. A., & Langerud, D. W. (2016). Guidelines for Cloud Seeding to Augment Precipitation (Third Edition.). Virginia, Estados Unidos de América: American Society of Civil Engineers (ASCE).

Keyes Jr, Conrad G.,, George W. Bomar, Thomas P. DeFelice, Don A. Griffith, and Darin W. Langerud. Guidelines for Cloud Seeding to Augment Precipitation. Third Edition. Virginia, Estados Unidos de América: American Society of Civil Engineers (ASCE), 2016.

Keyes Jr, Conrad G.,, et al. Guidelines for Cloud Seeding to Augment Precipitation. Third Edition. Virginia, Estados Unidos de América: American Society of Civil Engineers (ASCE), 2016.