PHUSAVAT, Kongkiti. Productivity management in an organization : measurement and analysis. 1st ed.. Bangkok; Celje; Lublin : ToKnowPress, 2013. 214 str.. http://www.toknowpress.net/ISBN/978-961-6914-05-5.pdf; http://www.toknowpress.net/ISBN/978-961-6914-06-2/flipbook.html. ISBN 978-961-6914-04-8.