Bull, Christopher. Team strings : double bass / [Música impresa] Christopher Bull, Olive Goodborn & Richard Duckett. - London : IMP, 1993. - 66 p. ; 31 cm + 1 suplement + 1 CD. ISBN: 1-84328-538-X LCCN: 5573 Subjects--Topical Terms: Contrabaix---Estudis i exercicis.