Cambrian Geology and Paleontology II: No 6--Middle Cambrian Branchiopdada, Malocrastraca, Trilobita, and Merostomata

Chicago citation style
Walcott, Charles D. Cambrian Geology and Paleontology II: No 6--Middle Cambrian Branchiopdada, Malocrastraca, Trilobita, and Merostomata. 1912. Retrieved from the Digital Public Library of America, http://collections.si.edu/search/results.htm?q=record_ID%3ASILSRO_145155&repo=DPLA. (Accessed November 21, 2018.)
APA citation style
Walcott, Charles D, (1912) Cambrian Geology and Paleontology II: No 6--Middle Cambrian Branchiopdada, Malocrastraca, Trilobita, and Merostomata. Retrieved from the Digital Public Library of America, http://collections.si.edu/search/results.htm?q=record_ID%3ASILSRO_145155&repo=DPLA
MLA citation style
Walcott, Charles D. Retrieved from the Digital Public Library of America <http://collections.si.edu/search/results.htm?q=record_ID%3ASILSRO_145155&repo=DPLA>.
Note: These citations are programmatically generated and may be incomplete.