1. Blasche, GWE, & Campbell, DFJ (2013). Cross-retirement (cross-employed cross-retired) and innovation, 508-513. In Elias G. Carayannis (Editor-in-Chief). IN Dubina, N Seel, DFJ Campbell, D Uzunidis (Eds.), Encyclopedia of creativity, invention, innovation and entrepreneurship. New York: Springer. ( http://link.springer.com/referenceworkentry/10.1007/978-1-4614-3858-8_255 and http://www.springerreference.com/docs/html/chapterdbid/378720.html ).
2. Brandenburger, AM, & Nalebuff, BJ (1997). Co-opetition. New York: Doubleday.
3. Bush, V (1945). Science: the endless frontier. Washington: United States Government Printing Office ( http://www.nsf.gov/od/lpa/nsf50/vbush1945.htm#transmittal ).
4. Campbell, DFJ (2011). Wissenschaftliche “Parallelkarrieren” als Chance. Wenn Wissenschaft immer öfter zur Halbtagsbeschäftigung wird, könnte eine Lösung im “Cross-Employment” liegen. Guest Commentary for DIE PRESSE (February 2, 2011) ( http://diepresse.com/home/bildung/meinung/635781/Wissenschaftliche-Parallelkarrieren-als-Chance?direct=635777&_vl_backlink=/home/bildung/index.do&selChannel=500 ).
5. Campbell, DFJ (2013). Cross-employment, 503-508. In EG Carayannis (Editor-in-Chief), IN Dubina, N Seel, DFJ Campbell, D Uzunidis (Eds.), Encyclopedia of creativity, invention, innovation and entrepreneurship. New York: Springer. ( http://link.springer.com/referenceworkentry/10.1007/978-1-4614-3858-8_254 and http://www.springerreference.com/docs/html/chapterdbid/378719.html ).