Cita APA (7a ed.)

Ahn, F. (2015). A new practical and easy method of learning after the system.

Cita Chicago Style (17a ed.)

Ahn, F. A New Practical and Easy Method of Learning After the System. 2015.

Cita MLA (9a ed.)

Ahn, F. A New Practical and Easy Method of Learning After the System. 2015.