APA (7th ed.) Citation

Allan, M. E. (1973). A formidable enemy / Mabel Esther Allan. Heinemann.

Chicago Style (17th ed.) Citation

Allan, Mabel Esther. A Formidable Enemy / Mabel Esther Allan. London: Heinemann, 1973.

MLA (9th ed.) Citation

Allan, Mabel Esther. A Formidable Enemy / Mabel Esther Allan. Heinemann, 1973.

Warning: These citations may not always be 100% accurate.