Universitas/I.K.I.P. Kristen Satya Wacana, Universitas Muhammadiyah Surakarta, Institut Keguruan dan Ilmu Pendidikan Sanata Dharma, & Konrad-Adenauer-Stiftung. (1992). The impact of the teaching learning process on independent study by private university students in central Java and Yogyakarta: Final report, Yogyakarta, 1992. Joint research project Universitas Kristen Satya Wacana, Universitas Muhammadiyah, Surakarta, IKIP Sanata Dharma, Yogyakarta and Konrad Adenauer Stiftung.
Chicago-referens (17:e uppl.)Universitas/I.K.I.P. Kristen Satya Wacana, Universitas Muhammadiyah Surakarta, Institut Keguruan dan Ilmu Pendidikan Sanata Dharma, och Konrad-Adenauer-Stiftung. The Impact of the Teaching Learning Process on Independent Study by Private University Students in Central Java and Yogyakarta: Final Report, Yogyakarta, 1992. Salatiga: Joint research project Universitas Kristen Satya Wacana, Universitas Muhammadiyah, Surakarta, IKIP Sanata Dharma, Yogyakarta and Konrad Adenauer Stiftung, 1992.
MLA-referens (8:e uppl.)Universitas/I.K.I.P. Kristen Satya Wacana, et al. The Impact of the Teaching Learning Process on Independent Study by Private University Students in Central Java and Yogyakarta: Final Report, Yogyakarta, 1992. Joint research project Universitas Kristen Satya Wacana, Universitas Muhammadiyah, Surakarta, IKIP Sanata Dharma, Yogyakarta and Konrad Adenauer Stiftung, 1992.