APA (7th ed.) Citation

Sierra Club, Ecology Center, Inc, & High Plains Films. (2000). Wildland. Sierra Club.

Chicago Style (17th ed.) Citation

Sierra Club, Inc Ecology Center, and High Plains Films. Wildland. Washington, D.C.: Sierra Club, 2000.

MLA (9th ed.) Citation

Sierra Club, et al. Wildland. Sierra Club, 2000.