APA (7th ed.) Citation

Roper, E., Schäfler, K., & Auskerin, M. (1940). Sepher HaShanah: Gwrych Castle year book 1939/40. Gwrych Castle.

Chicago Style (17th ed.) Citation

Roper, Erich, Karl Schäfler, and Mary Auskerin. Sepher HaShanah: Gwrych Castle Year Book 1939/40. Abergele: Gwrych Castle, 1940.

MLA (8th ed.) Citation

Roper, Erich, et al. Sepher HaShanah: Gwrych Castle Year Book 1939/40. Gwrych Castle, 1940.