APA (7th ed.) Citation

Trefusis, V. (1990). Echo (1st American ed.). Viking.

Chicago Style (17th ed.) Citation

Trefusis, Violet. Echo. 1st American ed. New York: Viking, 1990.

MLA (9th ed.) Citation

Trefusis, Violet. Echo. 1st American ed. Viking, 1990.