Rajapura or Rajapuram was the capital of the ancient Kamboja Kingdom  mentioned in the Mahabharata. Karna led a war expedition against the Kamboja and some other tribes of the Uttarapatha a little time before the Kurukshetra war i.e. Karana Rajapuram gatva Kamboja Nirjitastvaya. The Chinese pilgrim Xuanzang who travelled to India in the 7th century refers to Hoshepulo which has been identified as Rajapura of Sanskrit tradition by Watters and others.
- See: Political History of Ancient India, 1996, p 132 seq, Dr H. C. Raychaudhury, Dr B. N. Mukerjee.
- A History of India, p 269-71, N. R. Ray, N. K. Sinha.
- Journal of Indian History, P 304, University of Allahabad. Department of Modern Indian History, University of Kerala - 1921; Military History of India, 1980, p 38, Hemendra Chandra Kar - History.
- Bimbisāra to Aśoka: with an appendix on the later Saud, 1977, p 16, Sudhakar Chattopadhyaya - India - 1977.
- Purana Index , 1992, p 79, A. B. L. Awasthi.
- Mahabharata 7/4/6) and 7/91/39-40
- On Yuan Chwang's travels in India, 629-645 A.D, Vol I, p 284, Thomas Watters, Thomas William Rhys Davids, Stephen Wootton Bushell.
- See: Political History of Ancient India, 1996, p 133 ff, Dr H. C. Raychaudhury, Dr B. N. Mukerjee.
- Buddhist centres in ancient India, 1969, p 162, Binayendra Nath Chaudhury.