APA Citation

Walker, J. n. 1., & Olk, J. (1970). Problems of conservation: Our natural resources. [Lugar de publicación no identificado]: Encyclopaedia Britannica Educational.

Chicago Style Citation

Walker, John n. 1906, and Jerry Olk. Problems of Conservation: Our Natural Resources. [Lugar de publicación no identificado]: Encyclopaedia Britannica Educational, 1970.

MLA Citation

Walker, John n. 1906, and Jerry Olk. Problems of Conservation: Our Natural Resources. [Lugar de publicación no identificado]: Encyclopaedia Britannica Educational, 1970.

Warning: These citations may not always be 100% accurate.