MLA

Morath, Inge, 1923-2002. South Africa. Box 145. 1989-1990. https://collections.library.yale.edu/catalog/15499211.

APA, 6th edition

Morath, Inge, 1923-2002. (["Box 145"])(1989-1990)[South Africa]. https://collections.library.yale.edu/catalog/15499211.