Language obsolescence.

Language death / by: (Language materials, printed)

The language revolution / by: (Language materials, printed)

Spoken here :travels among threatened languages / by: (Language materials, printed)

When languages diethe extinction of the world's languages and the erosion of human knowledge / by: (Electronic resources)

Vanishing voices :the extinction of the world's languages / by: (Language materials, printed)

Internet.

English language

Language obsolescence.

Language maintenance.

Language and languages.