APA (7th ed.) Citation

Unabia, C. C. (2000). The origin of the tobacco plant. no date of publication].

Chicago Style (17th ed.) Citation

Unabia, Carmen Ching. The Origin of the Tobacco Plant. [no place of publication: no date of publication], 2000.

MLA (9th ed.) Citation

Unabia, Carmen Ching. The Origin of the Tobacco Plant. no date of publication], 2000.