Não informado. (1976). Systematic Botany. American Society of Plant Taxonomists.
Chicago (17e ed.) BronvermeldingNão informado. Systematic Botany. Kent, Ohio: American Society of Plant Taxonomists, 1976.
MLA (8e ed.) BronvermeldingNão informado. Systematic Botany. American Society of Plant Taxonomists, 1976.
Let op: Deze citaties zijn niet altijd 100% accuraat.