MLA

Hemberger, Armin B., 1896-1974, Lawson, Robert. Robert Lawson. 20th century. https://collections.library.yale.edu/catalog/16788879.

APA, 6th edition

Hemberger, Armin B., 1896-1974, & Lawson, Robert. (20th century)[Robert Lawson]. https://collections.library.yale.edu/catalog/16788879.