APA

Rich M. F., . (1976). Who's who in opera: an international biographical directory of singers, conductors, directors, designers, and administrators, also including profiles of 101 opera companies. New York: Arno Press.

Chicago

Rich Maria F, . 1976. Who's who in opera: an international biographical directory of singers, conductors, directors, designers, and administrators, also including profiles of 101 opera companies. New York: Arno Press.

Harvard

Rich M. F., . (1976). Who's who in opera: an international biographical directory of singers, conductors, directors, designers, and administrators, also including profiles of 101 opera companies. New York: Arno Press.

MLA

Rich Maria F, . Who's who in opera: an international biographical directory of singers, conductors, directors, designers, and administrators, also including profiles of 101 opera companies. New York: Arno Press. 1976.