Harvard:
Greenberg, J.H. 1948, "The Classification of African Languages", in American Anthropologist, vol. 50, no. 1, pp. 24--30. American Anthropological Association.
APA:
Greenberg, J.H. (1948). The Classification of African Languages. American Anthropologist, 50 (1) , 24--30. American Anthropological Association.
Chicago:
Greenberg, Joseph H. 1948. "The Classification of African Languages." In American Anthropologist, 50 , no. 1: 24--30. American Anthropological Association.
MLA:
Greenberg, Joseph H. "The Classification of African Languages." American Anthropologist. 50.1 (1948): 24--30.
Citation within the text:
(Greenberg 1948)
Zotero:
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BibTeX:
@article{greenberg1948classification,
  source = {jstor},
  ISSN = {0002-7294},
  author = {Greenberg, Joseph H.},
  copyright = {Copyright 1948 American Anthropological Association},
  journal = {American Anthropologist},
  jstor_articletype = {Full Length Article},
  jstor_date = {194801/194803},
  jstor_formatteddate = {Jan. - Mar., 1948},
  jstor_issuetitle = {Part 1},
  month = {jan},
  number = {1},
  pages = {24--30},
  publisher = {American Anthropological Association},
  series = {2},
  title = {The Classification of African Languages},
  url = {http://links.jstor.org/sici?sici=0002-7294%28194801%2F03%292%3A50%3A1%3C24%3ATCOAL%3E2.0.CO%3B2-6},
  volume = {50},
  year = {1948},
}