MLA

Thomas and John Egerton (Firm). A catalogue of the library of John Henderson, Esq. ... : which will be sold by auction by T. and J. Egerton, ... on Monday, the 20th of February, 1786 .... [1786]. https://collections.library.yale.edu/catalog/16867950.

APA, 6th edition

Thomas and John Egerton (Firm). ([1786])[A catalogue of the library of John Henderson, Esq. ... : which will be sold by auction by T. and J. Egerton, ... on Monday, the 20th of February, 1786 ...]. https://collections.library.yale.edu/catalog/16867950.