Cita APA (7a ed.)

Mackensen, L. v., Schädel, C. H., Klemm, F., Goldbeck, G., Hermann, A., Bialas, V., . . . Gerlach, W. (1991). German natural scientist and inventors over four centuries. Inter Nationes Bonn.

Cita Chicago Style (17a ed.)

Mackensen, Ludolf von, Christian Hartmut Schädel, Friedrich Klemm, Gustav Goldbeck, Armin Hermann, Volker Bialas, Otto Krätz, y Walther Gerlach. German Natural Scientist and Inventors over Four Centuries. Bonn: Inter Nationes Bonn, 1991.

Cita MLA (9a ed.)

Mackensen, Ludolf von, et al. German Natural Scientist and Inventors over Four Centuries. Inter Nationes Bonn, 1991.