APA-ийн эшлэл(7 дахь хэвлэлт)

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

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

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

MLA -ийн эшлэл (9 дэх хэвлэлт)

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