APA (7th ed.) Citation

Blackstock, C. (1961). Witches' Sabbath. Romance Book Club.

Chicago Style (17th ed.) Citation

Blackstock, Charity. Witches' Sabbath. London: Romance Book Club, 1961.

MLA (8th ed.) Citation

Blackstock, Charity. Witches' Sabbath. Romance Book Club, 1961.