Παραπομπή APA

Doubtfire, D., & Horowicz, K. (1969). Fun with stamps for the younger collector. Hutchinsoin.

Παραπομπή Chicago Style

Doubtfire, Dianne, και Kay Horowicz. Fun with Stamps for the Younger Collector. London: Hutchinsoin, 1969.

Παραπομπή MLA

Doubtfire, Dianne, και Kay Horowicz. Fun with Stamps for the Younger Collector. Hutchinsoin, 1969.