APA (7th ed.) Citation

Beckwith, J. (1955). Six mobiles: New piano pieces for students in two sets. BMI Canada.

Chicago Style (17th ed.) Citation

Beckwith, John. Six Mobiles: New Piano Pieces for Students in Two Sets. Toronto: BMI Canada, 1955.

MLA (9th ed.) Citation

Beckwith, John. Six Mobiles: New Piano Pieces for Students in Two Sets. BMI Canada, 1955.