APA
Singh M. &. o., . (1980). Biology : A modern approach for class xii, vol.1. New Delhi: S.Cand & Co.
Chicago
Singh Manmohan & others, . 1980. Biology : A modern approach for class xii, vol.1. New Delhi: S.Cand & Co.
Harvard
Singh M. &. o., . (1980). Biology : A modern approach for class xii, vol.1. New Delhi: S.Cand & Co.
MLA
Singh Manmohan & others, . Biology : A modern approach for class xii, vol.1. New Delhi: S.Cand & Co. 1980.