Cita APA (7a ed.)

Collie, j. (2005). Speaking 4 student's book. Kanisius.

Cita Chicago Style (17a ed.)

Collie, joanne. Speaking 4 Student's Book. Kanisius, 2005.

Cita MLA (9a ed.)

Collie, joanne. Speaking 4 Student's Book. Kanisius, 2005.