Gaya APA
The Elementary School: Principles and Problems. (1969).
Boston:
Houghton Mifflin Company.
Gaya Chicago
The Elementary School: Principles and Problems.
.
Boston:
Houghton Mifflin Company,
1969.
.
Gaya MLA
The Elementary School: Principles and Problems.
.
Boston:
Houghton Mifflin Company,
1969.
.
Gaya Turabian
The Elementary School: Principles and Problems.
Boston:
Houghton Mifflin Company,
1969.
.