Kala at Ethnologue (18th ed., 2015) (subscription required)
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Kala kana bi na kapia : diksineri bilong Tok ples Kala (Kala dictionary). Wagner, John, 1949-, Schreyer, Christine, 1979-, DeVolder, Chara, 1989-, University of British Columbia. Okanagan Campus. Centre for Social, Spatial, and Economic Justice. Kelowna, B.C. May 2012. ISBN9780986538773. OCLC796918846.{{cite book}}: CS1 maint: location missing publisher (link) CS1 maint: others (link)