PRESSMAN, David - TUYTSCHAEVERS, Thomas J. Patent it yourself : your step-by-step guide to filing at the U.S. Patent Office. 18th ed. Berkeley : NOLO, 2016. 654 s. ISBN 978-1-4133-2257-6. ISSN 1554-9925. [Copy count : 2, currently available 0, at library only 2]