Smithsonian Institution. Office of the Secretary & Clark, A. H. (1921). Echinoderms as aberrant arthropods. [publisher not identified].
Chicago Style (17th ed.) CitationSmithsonian Institution. Office of the Secretary and Austin Hobart Clark. Echinoderms as Aberrant Arthropods. Washington, D.C.: [publisher not identified], 1921.
MLA (9th ed.) CitationSmithsonian Institution. Office of the Secretary and Austin Hobart Clark. Echinoderms as Aberrant Arthropods. [publisher not identified], 1921.
Warning: These citations may not always be 100% accurate.