Clarke, D., Silcock, E., Clarke, G., Clarke, D., & Wrigley, N. (1999). Grocery provision in the USA: Room for expansion? International Journal of Retail & Distribution Management, 27(1), pp. 8-21. doi:10.1108/09590559910252667

Clarke, David, E. Silcock, G.P Clarke, D.B Clarke, and N. Wrigley. "Grocery Provision in the USA: Room for Expansion?" International Journal of Retail & Distribution Management 27, no. 1 (1999): 8-21.

Clarke, David, et al. "Grocery Provision in the USA: Room for Expansion?" International Journal of Retail & Distribution Management 27.1 (1999): 8-21.