- EbookThe Musical Myths and Facts (Vol. 1&2)Carl Engel
- EbookMusical Myths and Facts, Volume I (of 2)Carl Engel
- EbookMusical InstrumentsCarl Engel
- EbookMusical Myths and Facts (Vol. 1&2)Carl Engel
- EbookMusical Myths and Facts, Volume II (of 2)Carl Engel
- EbookMusical InstrumentsCarl Engel
- EbookMusical InstrumentsCarl Engel