Forbush, E. H. (1907). Useful birds and their protection: Containing brief descriptions of the more common and useful species of Massachusetts, with accounts of their food habits, and a chapter on the means of attracting and protecting birds (2d ed.).
Lua i Stíl Chicago (17ú heag.)Forbush, Edward Howe. Useful Birds and Their Protection: Containing Brief Descriptions of the More Common and Useful Species of Massachusetts, with Accounts of Their Food Habits, and a Chapter on the Means of Attracting and Protecting Birds. 2d ed. [Boston, Mass.], 1907.
Lua MLA (8ú heag.)Forbush, Edward Howe. Useful Birds and Their Protection: Containing Brief Descriptions of the More Common and Useful Species of Massachusetts, with Accounts of Their Food Habits, and a Chapter on the Means of Attracting and Protecting Birds. 2d ed. 1907.