MLA

Edwards, Jonathan, 1703-1758. ALS to [Thomas Foxcroft?]. Box 22, folder 1291. 1749/50 Feb 19. https://collections.library.yale.edu/catalog/10900919.

APA, 6th edition

Edwards, Jonathan, 1703-1758. (["Box 22, folder 1291"])(1749/50 Feb 19)[ALS to [Thomas Foxcroft?]]. https://collections.library.yale.edu/catalog/10900919.