APA
National Council of Educational Research and Training, . (2015). Science text book for class IX. New Delhi: National Council for Educational Research and Training.
Chicago
National Council of Educational Research and Training, . 2015. Science text book for class IX. New Delhi: National Council for Educational Research and Training.
Harvard
National Council of Educational Research and Training, . (2015). Science text book for class IX. New Delhi: National Council for Educational Research and Training.
MLA
National Council of Educational Research and Training, . Science text book for class IX. New Delhi: National Council for Educational Research and Training. 2015.