Patri G.C, . (1975). Co-Ordinate Gometry. New Delhi: Ramesh Book Depo.
Patri G.C, . 1975. Co-Ordinate Gometry. New Delhi: Ramesh Book Depo.
Patri G.C, . Co-Ordinate Gometry. New Delhi: Ramesh Book Depo. 1975.
