Herge. (2002). The adventures of Tintin: The seven cyrstal balls. Egmont UK Ltd.
Chicago Style (17th ed.) CitationHerge. The Adventures of Tintin: The Seven Cyrstal Balls. London: Egmont UK Ltd, 2002.
MLA (9th ed.) CitationHerge. The Adventures of Tintin: The Seven Cyrstal Balls. Egmont UK Ltd, 2002.
Warning: These citations may not always be 100% accurate.