(1992). Global Positioning Systems technology and its application in environmental programs / by Robert Puterski [and others].
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Global Positioning Systems Technology and Its Application in Environmental Programs / by Robert Puterski [and Others]. 1992.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Global Positioning Systems Technology and Its Application in Environmental Programs / by Robert Puterski [and Others]. 1992.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.