APA (7th ed.) Citation

Bell, G. L., & Bell, F. E. E. O. (1953). The letters of Gertrude Bell. Penguin.

Chicago Style (17th ed.) Citation

Bell, Gertrude Lowthian, and Florence Eveleen Eleanore Olliffe Bell. The Letters of Gertrude Bell. Melbourne [etc.]: Penguin, 1953.

MLA (9th ed.) Citation

Bell, Gertrude Lowthian, and Florence Eveleen Eleanore Olliffe Bell. The Letters of Gertrude Bell. Penguin, 1953.