APA (7th ed.) Citation

Evans, A. W. (1920). The North American species of Asterella. Government Printing Office.

Chicago Style (17th ed.) Citation

Evans, Alexander W. The North American Species of Asterella. Washington: Government Printing Office, 1920.

MLA (9th ed.) Citation

Evans, Alexander W. The North American Species of Asterella. Government Printing Office, 1920.