General

• "International Wrestling Grand Prix Heavyweight Title". Wrestling Titles.com. สืบค้นเมื่อ 2015-09-13.
• "IWGP Heavyweight Championship history". New Japan Pro Wrestling (in Japanese). NJPW.co.jp. สืบค้นเมื่อ 2015-09-13.CS1 maint: Unrecognized language (link)
• Duncan, Royal; Gary Will. "I.W.G.P Heavyweight Title History". Solie.org. สืบค้นเมื่อ 2015-09-13.
• "Pro Wrestling Illustrated: 2008 Wrestling Almanac & Book of Facts". 29 (5). Sports & Entertainment Publications, LLC: 107–108. ISSN 1043-7576.

Specific