PNP MEMO CIRCULAR NO. 2011-027<SUP STYLE="COLOR: RGB(255, 0, 0);">*</SUP>, December 30, 2011
GENERAL GUIDELINES IN THE CONDUCT OF PRODUCT TEST, POST-QUALIFICATION, FUNCTIONAL TEST AND EVALUATION FOR LAND TRANSPORTATION
National Administrative Register December 30, 2011
* Text Available at Office of the National Administrative Register, U.P. Law Complex, Diliman, Quezon City.