Reference: Crowther et al. 1950[1937]

Crowther, Samuel Ajayi, E.J. Sowande, E. Fry & T.A.J. Ogunbiyi. 1950[1937]. A dictionary of the Yoruba language. 2nd edn. London: Oxford University Press. 243pp.

@book{crowther1937yoruba,
  address   = {London},
  author    = {Crowther, Samuel Ajayi and Sowande, E.J. and Fry, E. and Ogunbiyi, T.A.J.},
  edition   = {2},
  pages     = {243},
  publisher = {Oxford University Press},
  title     = {A dictionary of the Yoruba language},
  year      = {1950[1937]}
}