Gaya APA
Nicol, R. et al
(1990).
Tidur nyenyak tanpa obat ( Sleep like a dram the drugfree way )
.
Jakarta:
Arcan.
Gaya MLA
Nicol, Rosemary. et al.
"Tidur nyenyak tanpa obat ( Sleep like a dram the drugfree way )".
Jakarta:
Arcan,
1990.
Text.