APA

Casement C., . (1971). Ringing robinsone. London: A world's children's book.

Chicago

Casement Christina, . 1971. Ringing robinsone. London: A world's children's book.

Harvard

Casement C., . (1971). Ringing robinsone. London: A world's children's book.

MLA

Casement Christina, . Ringing robinsone. London: A world's children's book. 1971.