APA Format
Oboli, H.O.N. (1960).
A sketch map atlas of Nigeria / H.O.N. Oboli
. London :: George G. Harrop,.
MLA Format
Oboli, H.O.N.
A sketch map atlas of Nigeria / H.O.N. Oboli
. London :: George G. Harrop,, 1960
Chicago Format
Oboli, H.O.N. A sketch map atlas of Nigeria / H.O.N. Oboli. London :: George G. Harrop,, 1960.