- Author: Betsy M. Sprouse, Sarah H. Gueldner, Leonard W. Poon
- Language: English
- Year: 2003
- Author: Wojtek J Chodzko-Zajko, Arthur F Kramer, Leonard W Poon
- Language: English
- Year: 2009
- Author: Leonard W. Poon Jiska Cohen-Mansfield
- Language: English
- Year: 2011