Gaya APA
21 Lessons for the 21 st Century. (2018).
London:
Jonathan Cape.
Gaya Chicago
21 Lessons for the 21 st Century.
ed.1.
London:
Jonathan Cape,
2018.
.
Gaya MLA
21 Lessons for the 21 st Century.
ed.1.
London:
Jonathan Cape,
2018.
.
Gaya Turabian
21 Lessons for the 21 st Century.
London:
Jonathan Cape,
2018.
.