Published in Gardens' Bulletin, Singapore, in 1980, in volume 33, issue 1, pages 1-30

Published in Gardens' Bulletin, Singapore, in 1980, in volume 33, issue 1, pages 31-150

Published in Gardens' Bulletin, Singapore, in 1980, in volume 33, issue 1, pages 151-263

Published in Gardens' Bulletin, Singapore, in 1980, in volume 33, issue 2, pages 264-289

Published in Gardens' Bulletin, Singapore, in 1980, in volume 33, issue 2, pages 290-296

Published in Gardens' Bulletin, Singapore, in 1980, in volume 33, issue 2, pages 297-301

Published in Gardens' Bulletin Singapore, in 1980, in volume 33, issue 2, pages 302

Published in Gardens' Bulletin, Singapore, in 1980, in volume 33, issue 2, pages 303-311

Published in Gardens' Bulletin, Singapore, in 1980, in volume 33, issue 2, pages 312-327

Published in Gardens' Bulletin Singapore, in 1980, in volume 33, issue 2, pages 329-367