APA (7th ed.) Citation

Big Bend Natural History Association, United States. National Park Service, & Pearson, J. R. (1982). River guide to the Rio Grande. Big Bend Natural History Association in cooperation with the National Park Service.

Chicago Style (17th ed.) Citation

Big Bend Natural History Association, United States. National Park Service, and John R. Pearson. River Guide to the Rio Grande. [United States]: Big Bend Natural History Association in cooperation with the National Park Service, 1982.

MLA (9th ed.) Citation

Big Bend Natural History Association, et al. River Guide to the Rio Grande. Big Bend Natural History Association in cooperation with the National Park Service, 1982.