Cita APA (7th ed.)

Haan, H., & Celestin, J. (1989). Urban formal sector information: Needs and methods. International Labour Office.

Cita Chicago (17th ed.)

Haan, Hans, i J.B Celestin. Urban Formal Sector Information: Needs and Methods. Geneva: International Labour Office, 1989.

Cita MLA (9th ed.)

Haan, Hans, i J.B Celestin. Urban Formal Sector Information: Needs and Methods. International Labour Office, 1989.