Gaya APA
WELTON, D, A., MALLAN, J, T.
(1981).
Children and their world
(
2nd ed.)
.
Boston:
Houghton Mifflin Company.
Gaya MLA
WELTON, David, A.., MALLAN, John, T..
"Children and their world".
2nd ed.
Boston:
Houghton Mifflin Company,
1981.
Text.