APA (7e ed.) Bronvermelding

Howard, F. E. The Child-Voice in Singing Treated from a physiological and a practical standpoint and especially adapted to schools and boy choirs.

Chicago (17e ed.) Bronvermelding

Howard, Francis E. The Child-Voice in Singing Treated from a Physiological and a Practical Standpoint and Especially Adapted to Schools and Boy Choirs.

MLA (9e ed.) Bronvermelding

Howard, Francis E. The Child-Voice in Singing Treated from a Physiological and a Practical Standpoint and Especially Adapted to Schools and Boy Choirs.