Carlson, Jeff
Palm organizers
Peachpit Press, 2002
Buku Teks
Crooks, Clayton E.
Palm development
Que Publishing, 2002
Buku Teks
Palm oil/ edited by F.D Gunstone
John Wiley & Sons, 1987
Buku Teks
Dale, Ernest
The Great organizers
McGraw-Hill, 1960
Buku Teks
Dale, Ernest
Greaat organizers
McGraw-Hill, 1960
Buku Teks