APA

Abraham; Vatsala, . (1981). Introduction to orchids: With illustration and description of 150 south Indian orchids. : Tropical Botanic Garden & Research Institute, TVPM.

Chicago

Abraham; Vatsala, . 1981. Introduction to orchids: With illustration and description of 150 south Indian orchids. : Tropical Botanic Garden & Research Institute, TVPM.

Harvard

Abraham; Vatsala, . (1981). Introduction to orchids: With illustration and description of 150 south Indian orchids. : Tropical Botanic Garden & Research Institute, TVPM.

MLA

Abraham; Vatsala, . Introduction to orchids: With illustration and description of 150 south Indian orchids. : Tropical Botanic Garden & Research Institute, TVPM. 1981.