APA

Opie I. A., Opie P., . (1951). The Oxford dictionary of nursery rhymes. Oxford: Clarendon Press.

Chicago

Opie Iona Archibald, Opie Peter, . 1951. The Oxford dictionary of nursery rhymes. Oxford: Clarendon Press.

Harvard

Opie I. A., Opie P., . (1951). The Oxford dictionary of nursery rhymes. Oxford: Clarendon Press.

MLA

Opie Iona Archibald, Opie Peter, . The Oxford dictionary of nursery rhymes. Oxford: Clarendon Press. 1951.