Gaya APA
Gallagher, N. (2013).
DELTA'S KEY TO THE TOEFL IBT; Seven Practice Tests + CD (Revised).
USA:
DELTA PUBLISHING COMPANY.
Gaya MLA
Gallagher, Nancy.
"DELTA'S KEY TO THE TOEFL IBT; Seven Practice Tests + CD".
Revised
USA:
DELTA PUBLISHING COMPANY,
2013.
Text.