APA (7e ed.) Bronvermelding

Bird, M. H. (1991). Mathematics for young children: An active thinking approach. Routledge.

Chicago (17e ed.) Bronvermelding

Bird, Marion H. Mathematics for Young Children: An Active Thinking Approach. London: Routledge, 1991.

MLA (9e ed.) Bronvermelding

Bird, Marion H. Mathematics for Young Children: An Active Thinking Approach. Routledge, 1991.