APA

Sloane H. N., Gurnee R. H., . (1966). Visiting American caves. New York: Crown Publishers.

Chicago

Sloane Howard N, Gurnee Russell H, . 1966. Visiting American caves. New York: Crown Publishers.

Harvard

Sloane H. N., Gurnee R. H., . (1966). Visiting American caves. New York: Crown Publishers.

MLA

Sloane Howard N, Gurnee Russell H, . Visiting American caves. New York: Crown Publishers. 1966.