Cita APA (7th ed.)

Callaghan, J. (1992). Costing for contracts. Directory of cocial change.

Cita Chicago (17th ed.)

Callaghan, John. Costing for Contracts. London: Directory of cocial change, 1992.

Cita MLA (8th ed.)

Callaghan, John. Costing for Contracts. Directory of cocial change, 1992.