APA
Tyrer P., . (1985). How to sleep better. Sudha, London: .
Chicago
Tyrer Peter, . 1985. How to sleep better. Sudha, London: .
Harvard
Tyrer P., . (1985). How to sleep better. Sudha, London: .
MLA
Tyrer Peter, . How to sleep better. Sudha, London: . 1985.