Harvard:
Hoffmann, J. and Emelen, V.A. 1930, "Encyclopaedia Mundarica, in 13 Vols",
APA:
Hoffmann, J. and Emelen, V.A. (1930). Encyclopaedia Mundarica, in 13 Vols. .
Chicago:
Hoffmann, J. and Von A. Emelen. 1930. "Encyclopaedia Mundarica, in 13 Vols." .
MLA:
Hoffmann, J. and Von A. Emelen. "Encyclopaedia Mundarica, in 13 Vols." (1930): .
Citation within the text:
(Hoffmann & Emelen 1930)
Zotero:
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BibTeX:
@article{hoffmann1930encyclopaedia,
  title = {Encyclopaedia Mundarica, in 13 Vols},
  author = {Hoffmann, J. and Emelen, Von A.},
  year = {1930},
  source = {nagaraja1989},
}