APA

Andersen H. C., Keigwin R. P., . (1972). The ugly duckling. London: Glasgow.

Chicago

Andersen Hans Christian, Keigwin R P, . 1972. The ugly duckling. London: Glasgow.

Harvard

Andersen H. C., Keigwin R. P., . (1972). The ugly duckling. London: Glasgow.

MLA

Andersen Hans Christian, Keigwin R P, . The ugly duckling. London: Glasgow. 1972.