MLA

Collings, Samuel, and printmaker. Alas Poor Werter! [Graphic] Collings Fec. Pubd. 24 June 1785 by W. Humphrey, No. 227 Strand, 0AD. https://collections.library.yale.edu/catalog/10728002.

APA, 6th edition

Collings, S., & printmaker. (0 C.E.). Alas poor Werter! [graphic] Collings fec [Satires (Visual works) England 1785, Etchings England London 1785]. Pubd. 24 June 1785 by W. Humphrey, No. 227 Strand. https://collections.library.yale.edu/catalog/10728002.