APA (7th ed.) Zitazioa
Shenk, W. R. (1980). Mission focus: Current issues. Herald Press.
Chicago Style (17th ed.) Zitazioa
Shenk, Wilbert R. Mission Focus: Current Issues. Scottdale, Pa.: Herald Press, 1980.
MLA (9th ed.) Zitazioa
Shenk, Wilbert R. Mission Focus: Current Issues. Herald Press, 1980.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.