Gaya APA
Kirkpatrick, T, O., Lewis, C, T. (1995).
Effective supervision : preparing for the 21st century .
America:
The Dryden Press.
Gaya MLA
Kirkpatrick, Thomas, O.., Lewis, Chad, T..
"Effective supervision : preparing for the 21st century".
America:
The Dryden Press,
1995.
Text.