Backman, Fredrik
Noura Books, 2016
Buku Teks
Teresa Stoppani, Giorgio Ponzo, George Themistokleous.
Routledge, 2017
Buku Teks
Chalmers, A.F.
University of Green Sland Press, 1982
Buku Teks
Trese, Leo J.
Notre Dame, 1964
Buku Teks
Teamwork, Med Press
Media Pressindo, 1999
Buku Teks