Cita APA (7a ed.)

Lang, E. (1920). Eupen, Malmédy, Monschau. Albert Nauck.

Cita Chicago Style (17a ed.)

Lang, Eduard. Eupen, Malmédy, Monschau. Berlin: Albert Nauck, 1920.

Cita MLA (9a ed.)

Lang, Eduard. Eupen, Malmédy, Monschau. Albert Nauck, 1920.