Saussure, F. d. The nature of linguistic sign: Ferdinand de Saussure. The Routledge language and cultural theory reader.(2000).

Saussure, Ferdinand de. "The Nature of Linguistic Sign: Ferdinand De Saussure." The Routledge Language and Cultural Theory Reader.(2000) .

Saussure, Ferdinand de. "The Nature of Linguistic Sign: Ferdinand De Saussure." The Routledge Language and Cultural Theory Reader.(2000), .