APA-Zitierstil (7. Ausg.)

Porter, E., & Tully, B. (1997). Language learning needs analysis: For European trade unions ; six questionnaires. ETUCO.

Chicago-Zitierstil (17. Ausg.)

Porter, Elizabeth, und Barbara Tully. Language Learning Needs Analysis: For European Trade Unions ; Six Questionnaires. Brussels: ETUCO, 1997.

MLA-Zitierstil (9. Ausg.)

Porter, Elizabeth, und Barbara Tully. Language Learning Needs Analysis: For European Trade Unions ; Six Questionnaires. ETUCO, 1997.