Gaya APA

Ballard, J, N. (1998). Geophysical Exploration for Engineering and Environmental Investigations (Technical Engineering and Design Guides as Adapted from the U.S. Army Corps of Engineers: no. 23) . United States of America: ASCE Press.

Gaya MLA

Ballard, Joe, N.. "Geophysical Exploration for Engineering and Environmental Investigations (Technical Engineering and Design Guides as Adapted from the U.S. Army Corps of Engineers: no. 23)". United States of America: ASCE Press, 1998. Text.