Gaya APA

Verma, A, R., Krishna, P. (1966). Polymorphism and Polytypism in Crystals . New York: John Wiley & Sons, Inc..

Gaya MLA

Verma, Ajit, Ram., Krishna, P.. "Polymorphism and Polytypism in Crystals". New York: John Wiley & Sons, Inc., 1966. Text.