Ola, S. A. (1983). Tropical soils of Nigeria in engineering practice. A.A. Balkema ; Distributed in USA & Canada by MBS.
Čikaški stil citiranja (17. izdanje)Ola, S. A. Tropical Soils of Nigeria in Engineering Practice. Rotterdam : Salem, NH, USA: A.A. Balkema ; Distributed in USA & Canada by MBS, 1983.
MLA način citiranja (8. izdanje)Ola, S. A. Tropical Soils of Nigeria in Engineering Practice. A.A. Balkema ; Distributed in USA & Canada by MBS, 1983.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.