APA
(1990). NCERT Ganitham.Part.4. : State Institute Of Language Thiruvananthapuram.
Chicago
1990. NCERT Ganitham.Part.4. : State Institute Of Language Thiruvananthapuram.
Harvard
(1990). NCERT Ganitham.Part.4. : State Institute Of Language Thiruvananthapuram.
MLA
NCERT Ganitham.Part.4. : State Institute Of Language Thiruvananthapuram. 1990.