APA Style
OBrien, Trudie. (2013).
Ladders : Watery World .
USA:
National Geographic Learning.
Chicago Style
OBrien, Trudie.
Ladders : Watery World.
USA:
National Geographic Learning,
2013.
.
MLA Style
OBrien, Trudie.
Ladders : Watery World.
USA:
National Geographic Learning,
2013.
.
Turabian Style
OBrien, Trudie.
Ladders : Watery World.
USA:
National Geographic Learning,
2013.
.