The National Internal Revenue Code of 1986 as amended by PD no. 1991, PD no. 1994, PD no. 2006, PD no. 2007, PD no. 2009, PD no. 2031 - Nolledo, Jose N.; Philippines (Metro Manila, Philippines National Book Store, 1986)
Keywords: Internal revenue law - Philippines; Taxation - Law and legislation - Philippines