National Seminar on Global Positioning Systems in Australia Brisbane, Qld., Institution of Surveyors, Australia, Australian Key Centre in Land Information Studies, & Bretreger, K. (1987). First National Seminar on Global Positioning Systems in Australia, Bardon Professional Development Centre, Brisbane, 19th and 20th March 1987: Proceedings. Australian Key Centre in Land Information Studies, University of Queensland.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)National Seminar on Global Positioning Systems in Australia Brisbane, Qld., Australia Institution of Surveyors, Australian Key Centre in Land Information Studies, و K. Bretreger. First National Seminar on Global Positioning Systems in Australia, Bardon Professional Development Centre, Brisbane, 19th and 20th March 1987: Proceedings. St. Lucia, Qld.: Australian Key Centre in Land Information Studies, University of Queensland, 1987.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)National Seminar on Global Positioning Systems in Australia Brisbane, Qld., et al. First National Seminar on Global Positioning Systems in Australia, Bardon Professional Development Centre, Brisbane, 19th and 20th March 1987: Proceedings. Australian Key Centre in Land Information Studies, University of Queensland, 1987.