Yes, you are correct. I was in a coma for awhile and have lost my sense of smell. It just seemed odd to me that an academic researcher would have so many grammatical errors. It would have been kinder to have kept my mouth shut. If you can get hold of any copies of the Journal of the Siam Society, they have articles about Thai customs ranging from the past (Thai society in Ayutthaya) to the present day. There are some books that focus on the laws and customs of the old Thai kingdom of Lanna Thai such as, The Laws of King Me(a)ngrai by David K. Wyatt, and The Sheaf of Garlands of the Epochs of the Conqueror, which, I think is a treatise on 15th century Chiang Mai customs. It might be interesting to compare what you read in these books to more recent articles. Good luck with your research.