Gaya APA
GERSHON, L., B., &., S. (2012).
SKILLFUL LISTENING & SPEAKING STUDENTS BOOK 1 .
London:
MACMILLAN ACADEMIC SKILLS.
Gaya MLA
GERSHON, LIDA, BAKER, &, STEVEN.
"SKILLFUL LISTENING & SPEAKING STUDENTS BOOK 1".
London:
MACMILLAN ACADEMIC SKILLS,
2012.
Buku Inti.