APA استشهاد

C Sashikumar, K.K Neelakandan, & R Venugopalan. (1993). A book of Kerala birds: Part 1. World wide fund for nature.

استشهاد بنمط شيكاغو

C Sashikumar, K.K Neelakandan, و R Venugopalan. A Book of Kerala Birds: Part 1. Trivandrum: World wide fund for nature, 1993.

MLA استشهاد

C Sashikumar, et al. A Book of Kerala Birds: Part 1. World wide fund for nature, 1993.