Fries, C. C. (1977). The structure of english. Longman.
Cita Chicago Style (17a ed.)Fries, Charles C. The Structure of English. Gran Bretaña: Longman, 1977.
Cita MLA (9a ed.)Fries, Charles C. The Structure of English. Longman, 1977.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.