Kānsamrūat rāikān chaičhāi kh̨ōng khr̨ōpkhrūa Ph̨ō. S̨ō. 2506, Phāk Klāng : rāingan = Household expenditure survey B.E. 2506, Central region : advance report (Samnakngān Sathiti h̄æng Chāt, Samnak Nāyok Ratthamontrī, 1964)