APA Style
Shields, Amy.. ().
Trains .
dcu:
National Geographic.
Chicago Style
Shields, Amy..
Trains.
dcu:
National Geographic,
.
Text.
MLA Style
Shields, Amy..
Trains.
dcu:
National Geographic,
.
Text.
Turabian Style
Shields, Amy..
Trains.
dcu:
National Geographic,
.
Print.