Gaya APA
Blumberg, A., Greenfield,William, . (1980).
The effective principal : perspectives on school leadership .
Boston:
Allyn and Bacon.
Gaya MLA
Blumberg, Arthur., Greenfield,William, .
"The effective principal : perspectives on school leadership".
Boston:
Allyn and Bacon,
1980.
Buku Tercetak.