Gaya APA

HARPER, Bill. (1974). AFTER THE ABACUS . : .

Gaya Chicago

HARPER, Bill. AFTER THE ABACUS. : , 1974. Text.

Gaya MLA

HARPER, Bill. AFTER THE ABACUS. : , 1974. Text.

Gaya Turabian

HARPER, Bill. AFTER THE ABACUS. : , 1974. Print.