Gaya APA
Nasution, A, , L. et al (1990).
Reading Intermediate : Buku Tuntunan Belajar Mandiri .
United Kingdom:
Oxford University Press.
Gaya MLA
Nasution, Azfina, , Liza. et al.
"Reading Intermediate : Buku Tuntunan Belajar Mandiri".
United Kingdom:
Oxford University Press,
1990.
Text.