Gaya APA
Kay, S. et al (2019).
Focus 3 student`s book second edition (Ed.2).
Harlow, Essex, Inggris:
Pearson Central Europe / Pearson Education.
Gaya MLA
Kay, Sue. et al.
"Focus 3 student`s book second edition".
Ed.2
Harlow, Essex, Inggris:
Pearson Central Europe / Pearson Education,
2019.
Text.