Gaya APA

Campbell-Allen, D., Roper, H. (1991). Concrete structures : materials,maintenance and repair (Cet. 2). New York: Longman Scientific \\n Technical.

Gaya MLA

Campbell-Allen, Denison., Roper, Harold. "Concrete structures : materials,maintenance and repair". Cet. 2 New York: Longman Scientific \\n Technical, 1991. Text.