Cite

Map of the Territory of Montana with portions of the adjoining territories / drawn by W.W. de Lacy for the use of the First Legislature of Montana.

MLA

De Lacy, W. W. (Walter Washington), 1819-1892. Map of the Territory of Montana with portions of the adjoining territories / drawn by W.W. de Lacy for the use of the First Legislature of Montana.. BRBL_00579. [1865?]. https://collections.library.yale.edu/catalog/15814903.

APA, 6th edition

De Lacy, W. W. (Walter Washington), 1819-1892. (["BRBL_00579"])([1865?])[Map of the Territory of Montana with portions of the adjoining territories / drawn by W.W. de Lacy for the use of the First Legislature of Montana.]. https://collections.library.yale.edu/catalog/15814903.