Kuss, Oliver; Kluttig, Alexander; Greiser, Karin H. (December 2011). "Longevity of soccer players: an investigation of all German internationals from 1908 to 2006". Scandinavian Journal of Medicine & Science in Sports. 21 (6): e260–e265. doi:10.1111/j.1600-0838.2010.01269.x. PMID21435018. S2CID30783906. Pdf.
Kerr, Zachary Y.; Marshall, Stephen W.; Harding, Herndon P. Jr.; Guskiewicz, Kevin M. (October 2012). "Nine-year risk of depression diagnosis increases with increasing self-reported concussions in retired professional football players". American Journal of Sports Medicine. 40 (10): 2206–2212. doi:10.1177/0363546512456193. PMID22922518. S2CID25752165.
Ekstrand, Jan (2012). "Thigh Muscle Injuries in Professional Football Players: A Seven Year Follow-Up of the UEFA Injury Study". Sports Injuries Prevention, Diagnosis, Treatment and Rehabilitation: 871–875. doi:10.1007/978-3-642-15630-4_111. ISBN978-3-642-15629-8.
Brand, Serge; Beck, Johannes; Gerber, Markus; Hatzinger, Martin; Holsboer-Trachsler, Edith (November 2009). "'Football is good for your sleep': favorable sleep patterns and psychological functioning of adolescent male intense football players compared to controls". Journal of Health Psychology. 14 (8): 1144–1155. doi:10.1177/1359105309342602. PMID19858334. S2CID10312855.
Strudwick, A.; Reilly, T.; Doran, D. (June 2002). "Anthropometric and fitness profiles of elite players in two football codes". The Journal of Sports Medicine and Physical Fitness. 42 (2): 239–242. PMID12032422.
Kuss, Oliver; Kluttig, Alexander; Greiser, Karin H. (December 2011). "Longevity of soccer players: an investigation of all German internationals from 1908 to 2006". Scandinavian Journal of Medicine & Science in Sports. 21 (6): e260–e265. doi:10.1111/j.1600-0838.2010.01269.x. PMID21435018. S2CID30783906. Pdf.
Kerr, Zachary Y.; Marshall, Stephen W.; Harding, Herndon P. Jr.; Guskiewicz, Kevin M. (October 2012). "Nine-year risk of depression diagnosis increases with increasing self-reported concussions in retired professional football players". American Journal of Sports Medicine. 40 (10): 2206–2212. doi:10.1177/0363546512456193. PMID22922518. S2CID25752165.
Brand, Serge; Beck, Johannes; Gerber, Markus; Hatzinger, Martin; Holsboer-Trachsler, Edith (November 2009). "'Football is good for your sleep': favorable sleep patterns and psychological functioning of adolescent male intense football players compared to controls". Journal of Health Psychology. 14 (8): 1144–1155. doi:10.1177/1359105309342602. PMID19858334. S2CID10312855.
Kuss, Oliver; Kluttig, Alexander; Greiser, Karin H. (December 2011). "Longevity of soccer players: an investigation of all German internationals from 1908 to 2006". Scandinavian Journal of Medicine & Science in Sports. 21 (6): e260–e265. doi:10.1111/j.1600-0838.2010.01269.x. PMID21435018. S2CID30783906. Pdf.
Kuss, Oliver; Kluttig, Alexander; Greiser, Karin H. (December 2011). "Longevity of soccer players: an investigation of all German internationals from 1908 to 2006". Scandinavian Journal of Medicine & Science in Sports. 21 (6): e260–e265. doi:10.1111/j.1600-0838.2010.01269.x. PMID21435018. S2CID30783906. Pdf.
Kerr, Zachary Y.; Marshall, Stephen W.; Harding, Herndon P. Jr.; Guskiewicz, Kevin M. (October 2012). "Nine-year risk of depression diagnosis increases with increasing self-reported concussions in retired professional football players". American Journal of Sports Medicine. 40 (10): 2206–2212. doi:10.1177/0363546512456193. PMID22922518. S2CID25752165.
Brand, Serge; Beck, Johannes; Gerber, Markus; Hatzinger, Martin; Holsboer-Trachsler, Edith (November 2009). "'Football is good for your sleep': favorable sleep patterns and psychological functioning of adolescent male intense football players compared to controls". Journal of Health Psychology. 14 (8): 1144–1155. doi:10.1177/1359105309342602. PMID19858334. S2CID10312855.
Claridge, Steve (30 October 2007). "Sam Vokes, Wolves". The Guardian. London. Retrieved 13 December 2008. Scouting report on the Wolverhampton Wanderers forward based on these attributes.