MLA

Nagaratnam, Gary Cheuk, and Kujan Nagaratnam. Geriatric Diseases. Springer International Publishing, 2018.

APA

Nagaratnam, N., Cheuk, G., & Nagaratnam, K. (2018). Geriatric Diseases. Springer International Publishing.

Chicago

Nagaratnam, Gary Cheuk, and Kujan Nagaratnam. Geriatric Diseases. : Springer International Publishing, 2018.