343732 Tay, C. S. K. (1990). A guide to protecting your ideas, inventions, trade marks & products. Singapore : Times, 1997.
Cita Chicago (17th ed.)343732 Tay, Catherine Swee Kian. A Guide to Protecting Your Ideas, Inventions, Trade Marks & Products. Singapore : Times, 1997, 1990.
Cita MLA (9th ed.)343732 Tay, Catherine Swee Kian. A Guide to Protecting Your Ideas, Inventions, Trade Marks & Products. Singapore : Times, 1997, 1990.
Atenció: Aquestes cites poden no estar 100% correctes.