APA (7th ed.) Citation

1883-1969. Prichard, K. S. (1921). The black opal. Heinemann.

Chicago Style (17th ed.) Citation

1883-1969. Prichard, Katharine Susannah. The Black Opal. [London: Heinemann, 1921.

MLA (8th ed.) Citation

1883-1969. Prichard, Katharine Susannah. The Black Opal. Heinemann, 1921.

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