Cita APA (7th ed.)

ERRIDGE ANDREW. (2001). BEST PRACTICE PROCUREMENT. GOWER.

Cita Chicago (17th ed.)

ERRIDGE ANDREW. BEST PRACTICE PROCUREMENT. ENGLAND: GOWER, 2001.

Cita MLA (9th ed.)

ERRIDGE ANDREW. BEST PRACTICE PROCUREMENT. GOWER, 2001.