Hanson, P. (1970). Keypunching (2nd ed.). Prentice-Hall of India.
Chicago Style aipamenaHanson, Peggy. Keypunching. 2nd ed. New Jersey: Prentice-Hall of India, 1970.
MLA aipamenaHanson, Peggy. Keypunching. 2nd ed. Prentice-Hall of India, 1970.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.