Gaya APA
Daily Challenge 365 Puzzles. (2012).
London:
Ladybird Books.
Gaya Chicago
Daily Challenge 365 Puzzles.
.
London:
Ladybird Books,
2012.
Buku.
Gaya MLA
Daily Challenge 365 Puzzles.
.
London:
Ladybird Books,
2012.
Buku.
Gaya Turabian
Daily Challenge 365 Puzzles.
London:
Ladybird Books,
2012.
Buku.