APA
NCERT, .Physics: System of Particles & Rotational Motion Gravitation Pat-l Class-Xl. New Delhi: NCERT.
Chicago
NCERT, .Physics: System of Particles & Rotational Motion Gravitation Pat-l Class-Xl. New Delhi: NCERT.
Harvard
NCERT, .Physics: System of Particles & Rotational Motion Gravitation Pat-l Class-Xl. New Delhi: NCERT.
MLA
NCERT, .New Delhi: NCERT. .