Cita APA (7th ed.)
Clark, A. H. (1932). The Butterflies of the District of Columbia and vicinity. Gov. Print. Off.
Cita Chicago (17th ed.)
Clark, Austin Hobart. The Butterflies of the District of Columbia and Vicinity. Washington: Gov. Print. Off, 1932.
Cita MLA (9th ed.)
Clark, Austin Hobart. The Butterflies of the District of Columbia and Vicinity. Gov. Print. Off, 1932.
Atenció: Aquestes cites poden no estar 100% correctes.