MLA

Barber, John Warner, 1798-1885, Howe, Henry, 1816-1893, Sherman & Smith. Proposals for publishing in subscription, a work entitled Historical collections of the state of New York / by John W. Barber ... and Henry Howe .... 1841?]. https://collections.library.yale.edu/catalog/10618414.

APA, 6th edition

Barber, John Warner, 1798-1885, & Howe, Henry, 1816-1893, & Sherman & Smith. (1841?])[Proposals for publishing in subscription, a work entitled Historical collections of the state of New York / by John W. Barber ... and Henry Howe ...]. https://collections.library.yale.edu/catalog/10618414.