APA

Pratchett T., . (1988). Strata. London: Corgi Books.

Chicago

Pratchett T, . 1988. Strata. London: Corgi Books.

Harvard

Pratchett T., . (1988). Strata. London: Corgi Books.

MLA

Pratchett T, . Strata. London: Corgi Books. 1988.