Smithsonian Institution. Office of the Secretary & Schedl, K. E. (1931). Morphology of bark-beetles of genus Gnathotrichus Eichh. [publisher not identified].
Chicago Style (17th ed.) CitationSmithsonian Institution. Office of the Secretary and Karl E. Schedl. Morphology of Bark-beetles of Genus Gnathotrichus Eichh. Washington, D.C.: [publisher not identified], 1931.
MLA (9th ed.) CitationSmithsonian Institution. Office of the Secretary and Karl E. Schedl. Morphology of Bark-beetles of Genus Gnathotrichus Eichh. [publisher not identified], 1931.
Warning: These citations may not always be 100% accurate.