APA (7th ed.) Citation

Torre, F. d. l., & Patan, R. H. (1992). Steps towards an international trip: A technical english for students of tourism. (2a edición.). Trillas.

Chicago Style (17th ed.) Citation

Torre, Francisco de la, and Rosa Helena Patan. Steps Towards an International Trip: A Technical English for Students of Tourism. 2a edición. México: Trillas, 1992.

MLA (9th ed.) Citation

Torre, Francisco de la, and Rosa Helena Patan. Steps Towards an International Trip: A Technical English for Students of Tourism. 2a edición. Trillas, 1992.