APA (7th ed.) Citation

Poorten, G. M. V. D., & Poorten, N. E. V. D. (2018). Field guide to the butterflies of Sri Lanka. Lepodon Books.

Chicago Style (17th ed.) Citation

Poorten, George Michael Van Der, and Nancy E. Van Der Poorten. Field Guide to the Butterflies of Sri Lanka. [s.l.]: Lepodon Books, 2018.

MLA (9th ed.) Citation

Poorten, George Michael Van Der, and Nancy E. Van Der Poorten. Field Guide to the Butterflies of Sri Lanka. Lepodon Books, 2018.