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Gaya APA

Heins, K, N, D, D, C, P. (1981). Materials for Cipil and Highwey Engineers . Indonesia: Prentic-Hall.

Gaya MLA

Heins, Kenneth, N., Deruchr, Dan, Condrad, P.. "Materials for Cipil and Highwey Engineers". Indonesia: Prentic-Hall, 1981. Text.