Philippines. Bureau of Internal Revenue & Career Development Center. (2005). B.I.R revenue regulations: January 1-June 30, 2005. Career Development Center.
Chicago-viite (17. p.)Philippines. Bureau of Internal Revenue ja Career Development Center. B.I.R Revenue Regulations: January 1-June 30, 2005. [Quezon City: Career Development Center, 2005.
MLA-viite (9. p.)Philippines. Bureau of Internal Revenue ja Career Development Center. B.I.R Revenue Regulations: January 1-June 30, 2005. Career Development Center, 2005.
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