Social Science Association Press of Thailand
The imprint appears under slightly varying names across sources: "Social Science Association of Thailand," "Social Science Association Press of Thailand," and (in a Journal of Asian Studies review) simply "The Social Science Association Press." The Internet Archive catalogs at least one other 1960s book—Essays on Thai Folklore by Anuman Rajadhon—under the publisher "Social Science Association Press of Thailand," which supports that as a legitimate, consistently used form of the name.