Gaya APA
Children Solve Problems. (1972).
New York:
Penguin Books.
Gaya Chicago
Children Solve Problems.
.
New York:
Penguin Books,
1972.
Text.
Gaya MLA
Children Solve Problems.
.
New York:
Penguin Books,
1972.
Text.
Gaya Turabian
Children Solve Problems.
New York:
Penguin Books,
1972.
Print.