Smithsonian Institution. Office of the Secretary, Resser, C. E., & Walcott, C. D. (1931). Addenda to descriptions of Burgess Shale fossils. [publisher not identified].
Chicago Style (17th ed.) CitationSmithsonian Institution. Office of the Secretary, Charles Elmer Resser, and Charles D. Walcott. Addenda to Descriptions of Burgess Shale Fossils. Washington, D.C.: [publisher not identified], 1931.
MLA (9th ed.) CitationSmithsonian Institution. Office of the Secretary, et al. Addenda to Descriptions of Burgess Shale Fossils. [publisher not identified], 1931.
Warning: These citations may not always be 100% accurate.