Harvard:
Tuuk, H.N... and Scott-Kemball, J. xxxx, "A grammar of Toba Batak",
APA:
Tuuk, H.N... and Scott-Kemball, J. (xxxx). A grammar of Toba Batak. .
Chicago:
Tuuk, Hermanus Neubronner van der and Jeune Scott-kemball. xxxx. "A Grammar of Toba Batak." .
MLA:
Tuuk, Hermanus Neubronner van der and Jeune Scott-kemball. "A Grammar of Toba Batak." (xxxx): .
Citation within the text:
(Tuuk & Scott-Kemball xxxx)
Zotero:
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BibTeX:
@article{tuukxxxxgrammar,
  title = {A grammar of Toba Batak},
  author = {TUUK, Hermanus Neubronner van der and SCOTT-KEMBALL, Jeune},
  year = {xxxx},
  address = {Koninklijk Instituut voor Taal- Land- en Bolkenkunde; tr. series, 13},
  keywords = {Indonesia;Language},
  x-extra = {Koninklijk Instituut voor Taal- Land- en Bolkenkunde; tr. series, 13},
  BAS = {622418},
  source = {bas},
}