Some major aspects of the focus system in Isnag - Barlaan, Rodolfo Rosario (Ann Arbor, MI. University Microforms, 1987)
Thesis (Ph.D.)--The University of Texas at Arlington, 1986.
Keywords: Isnag language (Philippines).; Isnag language (Philippines) -- Grammar; Isnag language (Philippines) -- Semantics; Philippine languages -- Kalinga-Apayao.; Philippine languages -- Luzon, Northern