GUMMESSON, Evert. Total relationship marketing : marketing strategy moving from the 4Ps - product, price, promotion, place - of traditional marketing management to the 30Rs - the thirty relationships - of a new marketing paradigm. 2nd ed. Oxford : Butterworth-Heinemann, 2002. xiii, 350 s. ISBN 0-7506-5407-4. [Copy count : 1, currently available 0, at library only 1]