APA Citation

Walker, J. n. 1., & Olk, J. (1970). Problems of conservation, our natural resources. Chicago, III.: Encyclopaedia Britannica Educational Corp.

Chicago Style Citation

Walker, John n. 1906, and Jerry Olk. Problems of Conservation, Our Natural Resources. Chicago, III.: Encyclopaedia Britannica Educational Corp, 1970.

MLA Citation

Walker, John n. 1906, and Jerry Olk. Problems of Conservation, Our Natural Resources. Chicago, III.: Encyclopaedia Britannica Educational Corp, 1970.

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