APA (7th ed.) Citation

Das, I., & Pui, Y. M. (2015). Alfred Russel Wallace, evolutionist, on postage stamps.

Chicago Style (17th ed.) Citation

Das, I., and Yong Min Pui. Alfred Russel Wallace, Evolutionist, on Postage Stamps. 2015.

MLA (9th ed.) Citation

Das, I., and Yong Min Pui. Alfred Russel Wallace, Evolutionist, on Postage Stamps. 2015.

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