Leaver, Betty Lou
Achieving success in second language acquisition
Cambridge Press , 2005
 Buku Teks SO
Applied sport psychology : personal growth to peak performance
edited by Jean M. Williams
Mayfield Publishing, 2001
 Buku Teks SO
Applied sport psychology : personal growth to peak performance
edited by Jean M. Williams and Vikki Krane
McGraw-Hill, 2015
 Buku Teks SO
Tracy, Brian
TurboCoach: a powerful system for achieving breakthrough career success
American Management Association, 2005
 eBooks
Pinkerton, William J.
Project management: achieving project bottom-line success
McGraw-Hill , 2003
 Buku Teks SO