APA (7th ed.) Citation

Mortensen, T. (1910). On some West Indian Echinoids. Government Printing Office.

Chicago Style (17th ed.) Citation

Mortensen, Theodor. On Some West Indian Echinoids. Washington: Government Printing Office, 1910.

MLA (9th ed.) Citation

Mortensen, Theodor. On Some West Indian Echinoids. Government Printing Office, 1910.

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