APA

Bonney R., Stevens N., . (1967). Vehicle operating costs on bituminous, gravel and earth roads in East and Central Africa. London: Road Research Laboratory.

Chicago

Bonney RSP, Stevens NF, . 1967. Vehicle operating costs on bituminous, gravel and earth roads in East and Central Africa. London: Road Research Laboratory.

Harvard

Bonney R., Stevens N., . (1967). Vehicle operating costs on bituminous, gravel and earth roads in East and Central Africa. London: Road Research Laboratory.

MLA

Bonney RSP, Stevens NF, . Vehicle operating costs on bituminous, gravel and earth roads in East and Central Africa. London: Road Research Laboratory. 1967.