Gaya APA
Blyton, E.
(2013).
#4 Riddle of the Hollow Tree, The: Part of the Riddles Series
.
London:
Bounty Books.
Gaya MLA
Blyton, Enid.
"#4 Riddle of the Hollow Tree, The: Part of the Riddles Series".
London:
Bounty Books,
2013.
Text.