APA

Crowe B., Pre-school Playgroups Association, . (1977). The playgroup movement. London: Allen and Unwin [for] the Pre-school Playgroups Association.

Chicago

Crowe Brenda, Pre-school Playgroups Association, . 1977. The playgroup movement. London: Allen and Unwin [for] the Pre-school Playgroups Association.

Harvard

Crowe B., Pre-school Playgroups Association, . (1977). The playgroup movement. London: Allen and Unwin [for] the Pre-school Playgroups Association.

MLA

Crowe Brenda, Pre-school Playgroups Association, . The playgroup movement. London: Allen and Unwin [for] the Pre-school Playgroups Association. 1977.