MLA

Chung, and Kazuichi Okazaki. Diseases of the Gallbladder. Springer Singapore, 2020.

APA

Chung, C., & Okazaki, K. (2020). Diseases of the gallbladder. Springer Singapore.

Chicago

Chung, and Kazuichi Okazaki. Diseases of the Gallbladder. : Springer Singapore, 2020.