found: Peterson's graduate and professional programs, an overview, 1997:t.p. (Peterson's, Princeton, New Jersey) verso t.p. (Peterson's)
found: Peterson's guide to graduate and professional programs, an overview, 1996:t.p. (Peterson's, Princeton, New Jersey) verso t.p. (Peterson's Guides; Peterson's Guides, Inc.)
found: Peterson's WWW Home page, Mar. 17, 1997:About Peterson's (Peterson's is an information services company, the leading provider of information on US-accredited educational institutions; Peterson's is a member of the Thomson family of companies)
found: Graduate programs in psychology, 2001:t.p. (Peterson's, Thomson Learning)
notfound: Peterson's graduate schools in the U.S., 2006: t.p. (Thomson Peterson's)