Kuwayama, 4. Y. (1973). Trademarks and symbols. New York : Van Nostrand Reinhold.
Cita Chicago (17th ed.)Kuwayama, 419806 Yasaburo. Trademarks and Symbols. New York : Van Nostrand Reinhold, 1973.
Cita MLA (9th ed.)Kuwayama, 419806 Yasaburo. Trademarks and Symbols. New York : Van Nostrand Reinhold, 1973.
Atenció: Aquestes cites poden no estar 100% correctes.