Garbutt, D. (1967). Planning for profits. Gee & Co.
Chicago Style aipamenaGarbutt, Douglas. Planning for Profits. London: Gee & Co, 1967.
MLA aipamenaGarbutt, Douglas. Planning for Profits. Gee & Co, 1967.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.