Harlow, Ralph Volney
The United States
Holt, Rinehart and Wiston, 1961
 Buku Teks
Harlow, Ralph Volney
The United States
Holt, Rinehart and Wiston, 1961
 Buku Teks
United states
 Buku Teks
Jain, Sarah S. Lochlann
Injury: the politics of product design and safety law in the United States
Princeton University Press, 2006
 Buku Teks
Rees, Yvonne
Indoor water garden design
Hingkong : Page One Pgublishing, 2002,
 Buku Referensi