Gilbert Paper Company. (1975). Letterhead design: A business approach to a creative apportunity. Gilbert.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGilbert Paper Company. Letterhead Design: A Business Approach to a Creative Apportunity. Menasha: Gilbert, 1975.
एमएलए (9वां संस्करण) प्रशस्ति पत्रGilbert Paper Company. Letterhead Design: A Business Approach to a Creative Apportunity. Gilbert, 1975.
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