Citazione APA

Williams, H. M. (1991). An essential english grammar with usage and composition. Calicut University.

Stile di citazione Chicago

Williams, H. M. An Essential English Grammar with Usage and Composition. Kozhikode: Calicut University, 1991.

Citazione MLA

Williams, H. M. An Essential English Grammar with Usage and Composition. Calicut University, 1991.

Attenzione: Queste citazioni potrebbero non essere precise al 100%.