Skornicka, J. E., & Erdman, R. (1940). French Horn (Eb alto or mellophone): A follow up course for individual or like-instrument class instruction / J. E. Skornicka and R. Erdman. Rubank.

Skornicka, Joseph E., and R. Erdman. French Horn (Eb Alto or Mellophone): A Follow Up Course for Individual or Like-instrument Class Instruction / J. E. Skornicka and R. Erdman. Miami, Fl.: Rubank, 1940.

Skornicka, Joseph E., and R. Erdman. French Horn (Eb Alto or Mellophone): A Follow Up Course for Individual or Like-instrument Class Instruction / J. E. Skornicka and R. Erdman. Rubank, 1940.