Threats to Internal Validity in Worksite Health Promotion Program Research: Common Problems and Possible Solutions
1991 ◽
Vol 6
(2)
◽
pp. 112-122
◽
1984 ◽
Vol 11
(2)
◽
pp. 171-179
◽
2002 ◽
Vol 44
(8)
◽
pp. 776-780
◽
2010 ◽
Vol 52
(12)
◽
pp. 1160-1166
◽
2007 ◽
Vol 39
(Supplement)
◽
pp. S194
2001 ◽
Vol 43
(1)
◽
pp. 25-29
◽
1990 ◽
Vol 17
(4)
◽
pp. 395-407
◽