Cita APA (7th ed.)

Collie, j., & Slater, S. (2005). Speaking 2 student's book. Kanisius.

Cita Chicago (17th ed.)

Collie, joanne, i Stephen Slater. Speaking 2 Student's Book. Kanisius, 2005.

Cita MLA (9th ed.)

Collie, joanne, i Stephen Slater. Speaking 2 Student's Book. Kanisius, 2005.