| | | 2003 | 196 |
| | | 2004 | |
| | | 1990 | 115 |
| | | 1995 | 105 |
| | | 1997 | |
| HistoryJournal:The Gardens' Bulletin, Singapore | | 1995 | 116 |
| | | 2002 | 130 |
| MammalsJournal:The Gardens' Bulletin, Singapore | | 1995 | 157 |
| | | 1986 | 125 |
| | | 2005 | 250 |
| | | 2001 | 178 |
| | | 2005 | 211 |
| | | 1993 | |
| | | 2002 | 153 |
| | | 2008 | 146 |
| | | 2006 | |
| | | 2006 | 181 |
| | | 2004 | 103 |
| | | 1998 | 164 |
| | | 2002 | |