WILLIAM B.COLEMAN AND GREGORY J.TSONGALIS1999 年出版390 页ISBN：7506222396
JOHN OLMSTED III AND GREGORY M.WILLIAMS2002 年出版1163 页ISBN：0471390712
CORE TEXTBOOK OF GASTROENTEROLOGY
GREGORY L.EASTWOOD2222 年出版458 页ISBN：0397521022
U.S. government services contracting
Gregory A. Garrett2011 年出版347 页ISBN：9780808025771
ADVANCES IN CLINIDAL CHEMISTRY
GREGORY S.MAKOWSKI2017 年出版285 页ISBN：9780128120743
