Dyfyniad APA

Nippon Telegraph & Telephon Public Corporation. (1981). Guide to NTT. Tokyo: Nippon Telegraph & Telephon Public Corporation.

Dyfyniad Arddull Chicago

Nippon Telegraph & Telephon Public Corporation. Guide to NTT. Tokyo: Nippon Telegraph & Telephon Public Corporation, 1981.

Dyfyniad MLA

Nippon Telegraph & Telephon Public Corporation. Guide to NTT. Tokyo: Nippon Telegraph & Telephon Public Corporation, 1981.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.