APA (7th ed.) Citation

Freeman, H. B., Ilsley, L. C., & Zellers, D. H. (1928). Experiments in underground communication through earth strata. U.S. Government Printing Office.

Chicago Style (17th ed.) Citation

Freeman, Howard Bassett, L. C. Ilsley, and D. H. Zellers. Experiments in Underground Communication Through Earth Strata. [Washington?]: U.S. Government Printing Office, 1928.

MLA (9th ed.) Citation

Freeman, Howard Bassett, et al. Experiments in Underground Communication Through Earth Strata. U.S. Government Printing Office, 1928.