APA
(1950). Chambers`s encyclopedia.Vol.12: Roskilde-Spahi. London: .
Chicago
1950. Chambers`s encyclopedia.Vol.12: Roskilde-Spahi. London: .
Harvard
(1950). Chambers`s encyclopedia.Vol.12: Roskilde-Spahi. London: .
MLA
Chambers`s encyclopedia.Vol.12: Roskilde-Spahi. London: . 1950.