Presentation level protocol :
videotex standard.
APA Citation
American Telephone and Telegraph Company. (1981). Presentation level protocol: videotex standard. Parsippany, N. J.: American Telephone and Telegraph Company.
MLA Citation
American Telephone and Telegraph Company. Presentation Level Protocol: Videotex Standard. Parsippany, N. J.: American Telephone and Telegraph Company, 1981.
Warning: These citations may not always be complete (especially for serials).