Gaya APA

Ubogu, A., Mamman, J, A, M. (2009). Port-hinterland trucking constraints in Nigeria . nigeria: Elsevier.

Gaya MLA

Ubogu, A.E.., Mamman, J.A., Ariyo,, M.. "Port-hinterland trucking constraints in Nigeria". nigeria: Elsevier, 2009. Article.