Hofstadter, R. (1968). Turner and the sociology of the frontier.
Chicago Style aipamenaHofstadter, Richard. Turner and the Sociology of the Frontier. 1968.
MLA aipamenaHofstadter, Richard. Turner and the Sociology of the Frontier. 1968.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.