Gaya APA
Roberts, . (1959).
DIFFICULT DIAGNOSIS : A GUIDE TO THE INTERPRETATION OF OBSCURE ILLNES .
Philadelphia:
W.B Sauders Company.
Gaya MLA
Roberts, .
"DIFFICULT DIAGNOSIS : A GUIDE TO THE INTERPRETATION OF OBSCURE ILLNES".
Philadelphia:
W.B Sauders Company,
1959.
Text.