Παραπομπή σε μορφή APA (7η εκδ.)

ebrary, Inc, & Sgall, P. (1992). Variation in language: Code switching in Czech as a challenge for sociolinguistics. J. Benjamins Pub. Co..

Παραπομπή σε μορφή Chicago (17η εκδ.)

ebrary, Inc, και Petr Sgall. Variation in Language: Code Switching in Czech as a Challenge for Sociolinguistics. Amsterdam ; Philadelphia: J. Benjamins Pub. Co., 1992.

Παραπομπή σε μορφή MLA (9th εκδ.)

ebrary, Inc, και Petr Sgall. Variation in Language: Code Switching in Czech as a Challenge for Sociolinguistics. J. Benjamins Pub. Co., 1992.