Cita APA (7th ed.)

Ashworth, A. (1998). Civil engineering contractual procedures. Longman.

Cita Chicago (17th ed.)

Ashworth, Allan. Civil Engineering Contractual Procedures. Essex, U.K: Longman, 1998.

Cita MLA (9th ed.)

Ashworth, Allan. Civil Engineering Contractual Procedures. Longman, 1998.