Awon nkan merin ni asiko darapo lati felefele kan ti ipele.Lori Ipari ti awon kerin ipele, awon ipele ki o si increments, ati awon ere ntun awon ipo pelu onitesiwaju isoro.. 
Ní ọdún 1966, ó tẹ ìwé   The content and form of Yoruba Ìjálá,ti ilé iṣẹ́ ìtẹ̀wé Oxford University Press gbé jáde.. 