Taylor, Michael
Guinness Superlatives Limited, 1984
Buku Referensi
Taylor, Mike
Crowood Press, 1995
Buku Teks
editor, Donald McFarlan
Guinness Publishing, 1990
Buku Referensi
Jonathan Tjahjadi
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2016
UI - Tesis Membership
London Guinnes Books 1987
Buku Referensi