Gaya APA
LUCE, G, G., SEGAL, J.
(1970).
Insomnia : The guide for troubled sleepers
.
London:
Longman.
Gaya MLA
LUCE, Gay, Gaer., SEGAL, Julius.
"Insomnia : The guide for troubled sleepers".
London:
Longman,
1970.
Text.