Harvard:
Roberts, H. 1891, "A Grammar of Khassi Language",
APA:
Roberts, H. (1891). A Grammar of Khassi Language. .
Chicago:
Roberts, H. 1891. "A Grammar of Khassi Language." .
MLA:
Roberts, H. "A Grammar of Khassi Language." (1891): .
Citation within the text:
(Roberts 1891)
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BibTeX:
@article{roberts1891grammar,
  title = {A Grammar of Khassi Language},
  author = {Roberts, H.},
  year = {1891},
  source = {nagaraja1989},
}