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. s.n.
Цитирование в стиле Чикаго (17-е изд.)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. [Boston, Mass: s.n, 1907.
Цитирование MLA (9-е изд.)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. s.n, 1907.