APA

Kerali H., Snaith M. & Koole R. (1991). The economic viability of upgrading low volume roads. London: Shell Supply and Marketing Publication SM/M/91/52.

Chicago

Kerali HR, Snaith MS and Koole RC. 1991. The economic viability of upgrading low volume roads. London: Shell Supply and Marketing Publication SM/M/91/52.

Harvard

Kerali H., Snaith M. and Koole R. (1991). The economic viability of upgrading low volume roads. London: Shell Supply and Marketing Publication SM/M/91/52.

MLA

Kerali HR, Snaith MS and Koole RC. The economic viability of upgrading low volume roads. London: Shell Supply and Marketing Publication SM/M/91/52. 1991.