Gaya APA

Winchell, A, N. (1939). Elements of Optical Mineralogy An Introduction to Microscopic Petrography 4th.ed Part II . New Delhi: Wiley Eastern Private Limited.

Gaya MLA

Winchell, Alexandr, N.. "Elements of Optical Mineralogy An Introduction to Microscopic Petrography 4th.ed Part II". New Delhi: Wiley Eastern Private Limited, 1939. Text.