Published in Gardens' Bulletin, Singapore, in 1972, in volume 26, issue 1, pages 49-61

Created: 2016-08-10, modified: 2016-08-10

Published in Gardens' Bulletin Singapore, in 1969, in volume 24, pages 1-11

Created: 2018-12-17, modified: 2018-12-17

Published in Gardens' Bulletin, Singapore, in 1987, in volume 40, issue 1, pages 15-30

Created: 2016-07-14, modified: 2016-07-14