I can study L3 with L1 or L2 material/textbooks/dictionaries, or combination of L1 and L2 materials (switching daily for instance). Which will be most beneficial?
My main concern is retention of new words as I look up the translation. I don't use monolingual/explanatory dictionaries since they distract from the reading material.
I'm mostly interested in studies that touch the subject. But I would also appreciate an overview and comparison of these methods from members of the community.