APA (7th ed.) Citation

Knowles, J. (1974). Christmas carols: For guitar. [J. Knowles?].

Chicago Style (17th ed.) Citation

Knowles, John. Christmas Carols: For Guitar. [United States]: [J. Knowles?], 1974.

MLA (9th ed.) Citation

Knowles, John. Christmas Carols: For Guitar. [J. Knowles?], 1974.

Warning: These citations may not always be 100% accurate.