APA (7th ed.) Citation

Clark, L. W. (1980). How to open your own shop or gallery. Penguin.

Chicago Style (17th ed.) Citation

Clark, Leta W. How to Open Your Own Shop or Gallery. Harmondsworth, Middlesex, Eng: Penguin, 1980.

MLA (9th ed.) Citation

Clark, Leta W. How to Open Your Own Shop or Gallery. Penguin, 1980.