Prof. dr hab. Adam Opalski authored Joint venture agreements; Group affiliation agreements – the problem of Art. 7 of the CCC (1st ed. – Chap. IX, 2nd ed. – Chap. X), in: W.J. Katner (ed.), System of Private Law, Vol. 9 - Law of obligations – innominate agreements, C.H. Beck.
Warsaw 2010, 2nd ed. 2015.