Rāingān phon kānsamrūat thatsanakhati kh̨ōng prachāk̨ōn kīeokap phāwa thāng sangkhom, Ph̨ō. S̨ō. 2531 = Report of the social attitude towards population survey 1988 (Samnakngān Sathiti h̄æng Chāt, Samnak Nāyok Ratthamontrī, 1989)