Hanson, P. (1970). Keypunching (2nd ed.). Prentice-Hall of India.
Čikaški stil citiranjaHanson, Peggy. Keypunching. 2nd ed. New Jersey: Prentice-Hall of India, 1970.
MLA način citiranjaHanson, Peggy. Keypunching. 2nd ed. Prentice-Hall of India, 1970.
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