Gaya APA
CLARENCE-SMITH, W, G.
(1996).
COCOA pioneer from since 1800 :
.
America:
Macmillan Press.
Gaya MLA
CLARENCE-SMITH, William, Gervase.
"COCOA pioneer from since 1800 :".
America:
Macmillan Press,
1996.
Buku.