APA (7th ed.) Citation

Walker, E. H. (1941). Plants collected by R. C. Ching in southern Mongolia and Kansu Province, China. Government Printing Office.

Chicago Style (17th ed.) Citation

Walker, Egbert H. Plants Collected by R. C. Ching in Southern Mongolia and Kansu Province, China. Washington: Government Printing Office, 1941.

MLA (9th ed.) Citation

Walker, Egbert H. Plants Collected by R. C. Ching in Southern Mongolia and Kansu Province, China. Government Printing Office, 1941.