Delap, D. J. (1968). Civil service manual. [U.S.A]: North Central Press.
Chicago Style aipamenaDelap, Donald J. Civil Service Manual. [U.S.A]: North Central Press, 1968.
MLA aipamenaDelap, Donald J. Civil Service Manual. [U.S.A]: North Central Press, 1968.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.