Cita APA (7a ed.)

Ribé i Queralt, R., & Vidal i Llorens, N. (1993). Project work: : step by step. Heinemann.

Cita Chicago Style (17a ed.)

Ribé i Queralt, Ramon, y Núria Vidal i Llorens. Project Work: : Step by Step. Oxford: Heinemann, 1993.

Cita MLA (9a ed.)

Ribé i Queralt, Ramon, y Núria Vidal i Llorens. Project Work: : Step by Step. Heinemann, 1993.