Gilbert Paper Company. (1975). Letterhead design: A business approach to a creative apportunity. Gilbert.
Citace podle Chicago (17th ed.)Gilbert Paper Company. Letterhead Design: A Business Approach to a Creative Apportunity. Menasha: Gilbert, 1975.
Citace podle MLA (9th ed.)Gilbert Paper Company. Letterhead Design: A Business Approach to a Creative Apportunity. Gilbert, 1975.
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