Gaya APA

Winchell, A, N., Winchell, H. (1937). Elements of Optical Mineralogy; an Introduction to Microscopic Petrograpy 5th.ed Part I . New Delhi: Wiley Eastern Private Limited.

Gaya MLA

Winchell, Alexander, N.., Winchell, Horace. "Elements of Optical Mineralogy; an Introduction to Microscopic Petrograpy 5th.ed Part I". New Delhi: Wiley Eastern Private Limited, 1937. Text.