APA (7th ed.) Citation

Grau, R. (1969). The stage in the twentieth century. B. Blom.

Chicago Style (17th ed.) Citation

Grau, Robert. The Stage in the Twentieth Century. New York: B. Blom, 1969.

MLA (9th ed.) Citation

Grau, Robert. The Stage in the Twentieth Century. B. Blom, 1969.