McFarlan, D. e. (1989). The guinness book of records 1990. Guinness Pub. Ltd.
Chicago-čujuhus (17. p.)McFarlan, Donald ed. The Guinness Book of Records 1990. Enfield: Guinness Pub. Ltd, 1989.
MLA-čujuhus (9. p.)McFarlan, Donald ed. The Guinness Book of Records 1990. Guinness Pub. Ltd, 1989.
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