APA (7th ed.) Citation

Eckel, E. B. (1959). Geology and mineral resources of Paraguay, a reconnaissance. U.S. Govt. Print. Off.

Chicago Style (17th ed.) Citation

Eckel, Edwin Butt. Geology and Mineral Resources of Paraguay, a Reconnaissance. Washington: U.S. Govt. Print. Off, 1959.

MLA (9th ed.) Citation

Eckel, Edwin Butt. Geology and Mineral Resources of Paraguay, a Reconnaissance. U.S. Govt. Print. Off, 1959.