Published in Gardens' Bulletin Singapore, in 1976, in volume 28, issue 2, pages 183-190

Published in Gardens' Bulletin Singapore, in 1976, in volume 28, issue 2, pages 191-226

Published in Gardens' Bulletin Singapore, in 1976, in volume 28, issue 2, pages 227-229

Published in Gardens' Bulletin Singapore, in 1976, in volume 28, issue 2, pages 231-234

Published in Gardens' Bulletin Singapore, in 1976, in volume 28, issue 2, pages 235-236

Published in Gardens' Bulletin Singapore, in 1976, in volume 28, issue 2, pages 237-258

Published in Gardens' Bulletin Singapore, in 1976, in volume 28, issue 2, pages 259-267

Published in Gardens' Bulletin Singapore, in 1976, in volume 28, issue 2, pages 269-276

Published in The Gardens' bulletin, Singapore, in 1976, in volume 29, pages 57-71