MLA

Portland Mechanics' Fair (10th : 1888 : Portland, Or.). Tenth annual exhibition of the Portland Mechanics' Fair of Portland, Oregon : rules and premium list, classificiation of exhibits. 1888. https://collections.library.yale.edu/catalog/31912981.

APA, 6th edition

Portland Mechanics' Fair (10th : 1888 : Portland, Or.). (1888)[Tenth annual exhibition of the Portland Mechanics' Fair of Portland, Oregon : rules and premium list, classificiation of exhibits]. https://collections.library.yale.edu/catalog/31912981.