Gaya APA

Pridgeon, A, M, [, A. (1999). Genera orchidacearum : volume 1 general introduction, Apostasioideae, Cypripedioideae (1st ed.). Oxford: Oxford University Press.

Gaya MLA

Pridgeon, Alec, M., [et, Al.]. "Genera orchidacearum : volume 1 general introduction, Apostasioideae, Cypripedioideae". 1st ed. Oxford: Oxford University Press, 1999. Text.