D. A. Ngilawajan, “Proses Berpikir Siswa SMA dalam Memecahkan Masalah Matematika Materi Turunan Ditinjau Dari Gaya Kognitif Field Independent dan Field Dependent: The Thinking Process of High School Students in Solving Mathematical Problems Derivative Materials in View of Field Independent and Field Dependent Cognitive Styles”, pedagogia, vol. 2, no. 1, pp. 71–83, Feb. 2013.