Keuken, G. J. v. d. (1979). Oral and visual: A new approach to vocabulary work, sentence structure and conversation for the middle forms of secondary and grammar schools and language courses (26.-27.opl.). Thieme.
Chicago-Zitierstil (17. Ausg.)Keuken, Gerrit J. van der. Oral and Visual: A New Approach to Vocabulary Work, Sentence Structure and Conversation for the Middle Forms of Secondary and Grammar Schools and Language Courses. 26.-27.opl. Zutphen: Thieme, 1979.
MLA-Zitierstil (9. Ausg.)Keuken, Gerrit J. van der. Oral and Visual: A New Approach to Vocabulary Work, Sentence Structure and Conversation for the Middle Forms of Secondary and Grammar Schools and Language Courses. 26.-27.opl. Thieme, 1979.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.