APA

Mansfield W., Farris E., . (1992). Public school principal survey on safe, disciplined, and drug-free schools: contractor report. Washington: National Center for Education Statistics.

Chicago

Mansfield Wendy, Farris Elizabeth, . 1992. Public school principal survey on safe, disciplined, and drug-free schools: contractor report. Washington: National Center for Education Statistics.

Harvard

Mansfield W., Farris E., . (1992). Public school principal survey on safe, disciplined, and drug-free schools: contractor report. Washington: National Center for Education Statistics.

MLA

Mansfield Wendy, Farris Elizabeth, . Public school principal survey on safe, disciplined, and drug-free schools: contractor report. Washington: National Center for Education Statistics. 1992.