The Reader's Encyclopedia of World Drama / ed. by John Gassner & Edward Quinn.

MLA

Gassner, John, and Edward Quinn. The Reader's Encyclopedia of World Drama / Ed. by John Gassner & Edward Quinn. London, 1970.

APA

Gassner, J., & Quinn, E. (1970). The Reader's Encyclopedia of World Drama / ed. by John Gassner & Edward Quinn. London.

Chicago

Gassner, John, and Edward Quinn. The Reader's Encyclopedia of World Drama / Ed. by John Gassner & Edward Quinn. London, 1970.