Gaya APA

Altenberg, E, P., Vago, R, M. (2010). English Grammar understanding the basics(E-Book) . United States of America: Cambridge University Press.

Gaya MLA

Altenberg, Evelyn., P., Vago, Robert., M. "English Grammar understanding the basics(E-Book)". United States of America: Cambridge University Press, 2010. E-book.