Published in Gardens' Bulletin Singapore, in 1964, in volume 20, issue 4, pages 289-294
Published in Gardens' Bulletin Singapore, in 1964, in volume 20, issue 4, pages 295-312
Published in Gardens' Bulletin Singapore, in 1964, in volume 20, issue 4, pages 313-314
Published in Gardens' Bulletin Singapore, in 1964, in volume 20, issue 4, pages 315-360
Published in Gardens' Bulletin Singapore, in 1964, in volume 20, issue 4, pages 361-368
Published in Gardens' Bulletin Singapore, in 1964, in volume 20, issue 4, pages 369-376
Published in Gardens' Bulletin Singapore, in 1964, in volume 20, issue 4, pages 377-380
Published in Gardens' Bulletin Singapore, in 1964, in volume 20, issue 4, pages 381-386