Nippon Telegraph & Telephon Public Corporation. (1981). Guide to NTT. Tokyo: Nippon Telegraph & Telephon Public Corporation.
Chicago Style citaatNippon Telegraph & Telephon Public Corporation. Guide to NTT. Tokyo: Nippon Telegraph & Telephon Public Corporation, 1981.
MLA citatieNippon Telegraph & Telephon Public Corporation. Guide to NTT. Tokyo: Nippon Telegraph & Telephon Public Corporation, 1981.
Let op: Deze citaties zijn niet altijd 100% accuraat.