Tetzchner, S. V., & Martinsen, H. (1992). Introduction to sign teaching and the use of communication aids / Stephen Von Tetzchner and Harald Martinsen. Whurr.
Chicago Style (17th ed.) CitationTetzchner, Stephen Von, and Harald Martinsen. Introduction to Sign Teaching and the Use of Communication Aids / Stephen Von Tetzchner and Harald Martinsen. London: Whurr, 1992.
MLA (9th ed.) CitationTetzchner, Stephen Von, and Harald Martinsen. Introduction to Sign Teaching and the Use of Communication Aids / Stephen Von Tetzchner and Harald Martinsen. Whurr, 1992.
Warning: These citations may not always be 100% accurate.