Gaya APA
Birney, G. Betty. (2008).
Trouble according to Humphrey : everyone's favorite classroom pet ! (Cet. 1).
New York:
Penguin Young Readers Group.
Gaya Chicago
Birney, G. Betty.
Trouble according to Humphrey : everyone's favorite classroom pet !.
Cet. 1
New York:
Penguin Young Readers Group,
2008.
.
Gaya MLA
Birney, G. Betty.
Trouble according to Humphrey : everyone's favorite classroom pet !.
Cet. 1
New York:
Penguin Young Readers Group,
2008.
.
Gaya Turabian
Birney, G. Betty.
Trouble according to Humphrey : everyone's favorite classroom pet !.
Cet. 1
New York:
Penguin Young Readers Group,
2008.
.