SJ Duggan, In the Shadow of Somoro: the Franciscan experience in the Sepik 1946–1975, MA Thesis La Trobe University Australia, 1983
SJ Duggan, Sandaun: A contribution to the study of education and development in the Sepik in the Sepik 1896–1988, Ph.D. Thesis, La Trobe University Australia, 1991
SJ Duggan, In the Shadow of Somoro: the Franciscan experience in the Sepik 1946–1975, MA Thesis La Trobe University Australia, 1983
SJ Duggan, Sandaun: A contribution to the study of education and development in the Sepik in the Sepik 1896–1988, Ph.D. Thesis, La Trobe University Australia, 1991