Cita APA (7th ed.)

Krapp, K. M. (1998). Notable twentieth-century scientists: Supplement. Gale Research.

Cita Chicago (17th ed.)

Krapp, Kristine M. Notable Twentieth-century Scientists: Supplement. Detroit: Gale Research, 1998.

Cita MLA (9th ed.)

Krapp, Kristine M. Notable Twentieth-century Scientists: Supplement. Gale Research, 1998.