Krapp, K. M. (1998). Notable twentieth-century scientists: Supplement. Gale Research.
Citazione stile Chigago Style (17a edizione)Krapp, Kristine M. Notable Twentieth-century Scientists: Supplement. Detroit: Gale Research, 1998.
Citatione MLA (9a ed.)Krapp, Kristine M. Notable Twentieth-century Scientists: Supplement. Gale Research, 1998.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.