Farkas, Philip. The art of French horn playing : a treatise on the problems and techniques of French horn playing ... / [Música impresa] by Philip Farkas. - Princeton : Summy-Birchard, c1956. - (95 p.) : il. ; 28 cm. ISBN: 0-87487-021-6 LCCN: 3545 Subjects--Topical Terms: Trompa---Mètodes.Trompa---Estudis i exercicis.