APA (7th ed.) Citation

Gardner, S., Lai, E. M., & Sidisunthorn, P. (2011). Heritage trees of Penang. Areca Books.

Chicago Style (17th ed.) Citation

Gardner, Simon, Ee May Lai, and Pindar Sidisunthorn. Heritage Trees of Penang. Penang: Areca Books, 2011.

MLA (8th ed.) Citation

Gardner, Simon, et al. Heritage Trees of Penang. Areca Books, 2011.