戰士是專門以從事戰鬥為業的人,包括軍人和傭兵等。[1][2]除了是一種角色或職業,在某些社會中也是階級或種性。在國家形成之前的社會就已經有戰士存在。在文明社會裡,由於戰士的生活完全是靠非戰士的勞動來維持,因而前者的數量從來也就不可能超過後者所能負擔的數量,不能超過後者在維持適合於他們自身身份的生活以及他們必須負擔的行政和司法官吏的生活的費用之後所能負擔的數量。
Head, Duncan "Armies of the Macedonian and Punic Wars 359 BC to 146 BC" (1982), p140.
Lenman, B., Anderson, T. Chambers Dictionary of World History, p. 200
L. Alcock. Kings and Warriors, Craftsmen and Priests in Northern Britain AD 550–850. Edinburgh: Society of Antiquaries of Scotland. 2003: 56. ISBN 0-903903-24-5.
A. Samad Ahmad. Sulalatus Salatin (Sejarah Melayu). Dewan Bahasa dan Pustaka. 1979: 44–45. ISBN 983-62-5601-6.
Sánchez-Murillo, R. (2012). La palabra universal. Ricardo Sánchez-Murillo. Retrieved September 5, 2012, from link 網際網路檔案館的存檔,存檔日期2013-10-29..
Pārati, Paktavatcala. Coromandel fishermen: an ethnography of Paṭṭaṇavar subcaste. Pondicherry Institute of Linguistics and Culture. 1999: 9. ISBN 9788185452098 (英語).
David Christian A history of Russia, Central Asia, and Mongolia, p.396
D'A. J. D. Boulton, "Classic Knighthood as Nobiliary Dignity", in Stephen Church, Ruth Harvey (ed.), Medieval knighthood V: papers from the sixth Strawberry Hill Conference 1994, Boydell & Brewer, 1995, pp. 41–100.
Frank Anthony Carl Mantello, A. G. Rigg, Medieval Latin: an introduction and bibliographical guide, UA Press, 1996, p. 448.
Charlton Thomas Lewis, An elementary Latin dictionary, Harper & Brothers, 1899, p. 505.
Lusted, Marcia Amidon (2017). Genghis Khan and the Building of the Mongol Empire. New York: The Rosen Publishing Group, Inc. p. 32. ISBN 9781499463521.
McGilvray, Dennis B. Tamils and Moors: caste and matriclan structure in eastern Sri Lanka. University of Chicago. 1974: 95 (英語).
Mazumder, Rajit K. The Indian Army and the Making of Punjab. : 99, 105.
Bayly, Susan. Saints, Goddesses and Kings: Muslims and Christians in South Indian Society, 1700-1900. Cambridge University Press. 2004-04-22: 25. ISBN 9780521891035 (英語).
Harley, T. Rutherford. The Public School of Sparta, Greece & Rome, Vol. 3, No. 9 (May 1934) pp. 129-139.).
Pivot politics: changing cultural identities in early state formation processes. Het Spinhuis. 1994: 165. ISBN 9789055890071 (英語).