APA引文

Choo, A., & Graham, L. C. (2016). Piano keyboard tutor.

Chicago Style Citation

Choo, Angie, and Leedham Charles Graham. Piano Keyboard Tutor. 2016.

MLA引文

Choo, Angie, and Leedham Charles Graham. Piano Keyboard Tutor. 2016.

警告：這些引文格式不一定是100％准確.