APA

(1981). Cologne, the first 100 years. [Cologne, Minn.]: [Cologne Centennial Book Committee].

Chicago

1981. Cologne, the first 100 years. [Cologne, Minn.]: [Cologne Centennial Book Committee].

Harvard

(1981). Cologne, the first 100 years. [Cologne, Minn.]: [Cologne Centennial Book Committee].

MLA

Cologne, the first 100 years. [Cologne, Minn.]: [Cologne Centennial Book Committee]. 1981.