Gaya APA
Jones, Leo. (1991).
Progress to Proficiency .
Cambridge:
Cambridge University Press.
Gaya Chicago
Jones, Leo.
Progress to Proficiency.
Cambridge:
Cambridge University Press,
1991.
Text.
Gaya MLA
Jones, Leo.
Progress to Proficiency.
Cambridge:
Cambridge University Press,
1991.
Text.
Gaya Turabian
Jones, Leo.
Progress to Proficiency.
Cambridge:
Cambridge University Press,
1991.
Print.