Harvard:
Whorf, B.L. 1945, "Grammatical Categories", in Language, vol. 21, no. 1, pp. 1--11. Linguistic Society of America.
APA:
Whorf, B.L. (1945). Grammatical Categories. Language, 21 (1) , 1--11. Linguistic Society of America.
Chicago:
Whorf, Benjamin Lee. 1945. "Grammatical Categories." In Language, 21 , no. 1: 1--11. Linguistic Society of America.
MLA:
Whorf, Benjamin Lee. "Grammatical Categories." Language. 21.1 (1945): 1--11.
Citation within the text:
(Whorf 1945)
Zotero:
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BibTeX:
@article{whorf1945grammatical,
  source = {jstor},
  ISSN = {0097-8507},
  abstract = {The paper outlines a general theory of grammatical categories. These fall into two main types, descriptive and taxonomic. Descriptive categories are either specific or generic. There are three kinds of specific categories: overt (phenotype), covert (cryptotype), and isosemantic; each of these is subdivided into selective categories and modulus categories. All terms in this classification are defined and illustrated.},
  author = {Whorf, Benjamin Lee},
  copyright = {Copyright 1945 Linguistic Society of America},
  journal = {Language},
  jstor_articletype = {Full Length Article},
  jstor_date = {194501/194503},
  jstor_formatteddate = {Jan. - Mar., 1945},
  month = {jan},
  number = {1},
  pages = {1--11},
  publisher = {Linguistic Society of America},
  title = {Grammatical Categories},
  url = {http://links.jstor.org/sici?sici=0097-8507%28194501%2F03%2921%3A1%3C1%3AGC%3E2.0.CO%3B2-2},
  volume = {21},
  year = {1945},
}