The organizational concept of professional staff training and lifelong education in Wielkopolska region at the level of basic vocational school, technical college, college, post-graduate education and consulting, Krzysztof Grupka, Maciej Szafrański, Marek Goliński, Prymasowskie Wydawnictwo Gaudentinum Sp. z o.o., Poznan-Gniezno, 2008 (ISBN 078-83-61311-31-7).