OCHEM, P. (2007, Januar 1). Letter frequency in infinite repetition-free words. 380(3). Amsterdam: Elsevier, 2007. Abgerufen von http://pascal-francis.inist.fr/vibad ndex.php?action=search&terms=18831180
ISO-690 (author-date, English)OCHEM, Pascal, 2007. Letter frequency in infinite repetition-free words. In: [online]. Amsterdam: Elsevier, 2007. 1 Januar 2007. Available from: http://pascal-francis.inist.fr/vibad ndex.php?action=search&terms=18831180
Modern Language Association 9th editionOCHEM, P. Letter frequency in infinite repetition-free words. Nr. 3, Amsterdam: Elsevier, 2007., 2007, http://pascal-francis.inist.fr/vibad ndex.php?action=search&terms=18831180.
Mohr Siebeck - Recht (Deutsch - Österreich)Emerald - Harvard
OCHEM, P. (2007), „Letter frequency in infinite repetition-free words“, in , Bd. 380, Amsterdam: Elsevier, 2007., verfügbar unter: http://pascal-francis.inist.fr/vibad ndex.php?action=search&terms=18831180.