APA (7th ed.) Citation

Clark, H. L. (1901). The echinoderms of Porto Rico. Government Printing Office.

Chicago Style (17th ed.) Citation

Clark, Hubert Lyman. The Echinoderms of Porto Rico. Washington: Government Printing Office, 1901.

MLA (9th ed.) Citation

Clark, Hubert Lyman. The Echinoderms of Porto Rico. Government Printing Office, 1901.

Warning: These citations may not always be 100% accurate.