Csikszentmihalyi, M. (1990). Literacy and Intrinsic Motivation. Daedalus, 119(2), 115–140. http://www.jstor.org/stable/20025303

Jasper, M. & Rosser, M. & Mooney, G. (2013) Professional Development, Reflection and Decision-Making in Nursing and Healthcare. 2nd edition. Chichester: John Wiley & Sons, Ltd.

Modeste Dayé. (2018). Volunteering at the Extensive Margin: Intrinsic or Extrinsic Motive? Annals of Economics and Statistics, 131, 117–136. https://doi.org/10.15609/annaeconstat2009.131.0117

Sachse, E. (1986) One Hundred Studies for Trumpet, G. Schirmer.

Schmidt, C. P. (2005). Relations among Motivation, Performance Achievement, and Music Experience Variables in Secondary Instrumental Music Students. Journal of Research in Music Education, 53(2), 134–147. https://www.jstor.org/stable/10.15609/annaeconstat2009.131.0117?seq=1
Stamp, J. (2005) Warm-Ups and Studies for Trumpet, 9th edition. Editions Bim Switzerland.