Cita APA (7a ed.)

Astuti, S. I. (2009). Simple step to toefl. Hi-fest Publishing.

Cita Chicago Style (17a ed.)

Astuti, Santi Indra. Simple Step to Toefl. Hi-fest Publishing, 2009.

Cita MLA (8a ed.)

Astuti, Santi Indra. Simple Step to Toefl. Hi-fest Publishing, 2009.