MLA

Viking Spillkort ; No. 11. N. W. Damm & Söns, 0AD. https://collections.library.yale.edu/catalog/10622067.

APA, 6th edition

Viking spillkort ; no. 11. (0 C.E.). [Specimens, Playing cards, Tax stamps (Printing)]. N. W. Damm & Söns. https://collections.library.yale.edu/catalog/10622067.