Spigolon, S. J. (2001). The McGraw-Hill civil engineering PE exam depth guide: Geotechnical engineering. New York: McGraw-Hill.
استشهاد بنمط شيكاغوSpigolon, S. J. The McGraw-Hill Civil Engineering PE Exam Depth Guide: Geotechnical Engineering. New York: McGraw-Hill, 2001.
MLA استشهادSpigolon, S. J. The McGraw-Hill Civil Engineering PE Exam Depth Guide: Geotechnical Engineering. New York: McGraw-Hill, 2001.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.