"Mathematics learning across the life span" [book] (2013). Kiel: IPN ("Mathematics learning across the life span", 2).
Chicago Manual of Style 17th edition (full note)"Mathematics learning across the life span". Book. "Mathematics learning across the life span" 2. Kiel: IPN, [2013?], Kiel: IPN, [2013?].
American Psychological Association 7th edition"Mathematics learning across the life span". (ca. 2013). [Book]. IPN.
Modern Language Association 9th edition"Mathematics learning across the life span". book, IPN, 2013.
ISO-690 (author-date, Deutsch)"Mathematics learning across the life span", 2013. . Kiel: IPN. "Mathematics learning across the life span", 2. ISBN 9783890882888
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.