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Buku Referensi
editor-in-chief, Craig Glenday
Officially Amazing, 2014
Buku Referensi
Guinness World Records Limited, editor; Glenday, Craig, editor
Guinness World Records Limited, 2016
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Tooley, Desmond Francis, author
Gower Press, 1973
Buku Teks
editor, Donald McFarlan
Guinness Publishing, 1990
Buku Referensi