Gaya APA

Libby, J, R. (1977). Modern Prestressed Concrete : Design Principles And Construction Methods (2). New York: Van Nostrand Reihhold Company.

Gaya MLA

Libby, James, R.. "Modern Prestressed Concrete : Design Principles And Construction Methods". 2 New York: Van Nostrand Reihhold Company, 1977. Text.