MLA

Alken, Samuel, 1756-1815, printmaker. http://id.loc.gov/authorities/names/n97864144. Reigate [graphic] / drawn by Rowlandson ; tinted by Alken.. 1790 June 1. https://collections.library.yale.edu/catalog/11791614.

APA, 6th edition

Alken, Samuel, 1756-1815, printmaker. http://id.loc.gov/authorities/names/n97864144. (1790 June 1)[Reigate [graphic] / drawn by Rowlandson ; tinted by Alken.]. https://collections.library.yale.edu/catalog/11791614.