In type 'A' [ Simple Pure-relational ] we distinguish in addition an isolating sub-type, characterized by the absence of all affixes and modifications of the radical element.
- Sapir (1921), a pag.139

In the isolating languages the syntactic relations are expressed by the position of the words in the sentence [...]
- Sapir (1921), a pag.139

[...] many languages of type 'B' [Complex Pure-relational ] the terms 'agglutinative', 'fusional', and 'symbolic' applying in their case merely to the treatment of the derivational, not the relational, concepts. Such languages could be termed 'agglutinative-isolating', 'fusional-isolating' and 'symbolic-isolating'.
- Sapir (1921), a pag.139