Will, R. W., & Krohn, W. E. (1989). Hand signs for technical terms used in thematic and topographic mapping: Sign-language terms used to communicate technical mapping terms between hearing and hearing-impaired people. U.S. Gov. Print. Off.
Chicago-Zitierstil (17. Ausg.)Will, Richard W., und William E. Krohn. Hand Signs for Technical Terms Used in Thematic and Topographic Mapping: Sign-language Terms Used to Communicate Technical Mapping Terms Between Hearing and Hearing-impaired People. Washington: U.S. Gov. Print. Off, 1989.
MLA-Zitierstil (9. Ausg.)Will, Richard W., und William E. Krohn. Hand Signs for Technical Terms Used in Thematic and Topographic Mapping: Sign-language Terms Used to Communicate Technical Mapping Terms Between Hearing and Hearing-impaired People. U.S. Gov. Print. Off, 1989.