Published in Gardens' Bulletin Singapore, in 1966, in volume 21, issue 3, pages 259-314

Published in Gardens' Bulletin Singapore, in 1966, in volume 21, issue 3, pages 315-378

Published in Gardens' Bulletin Singapore, in 1966, in volume 21, issue 3, pages 379-392

Published in Gardens' Bulletin Singapore, in 1966, in volume 21, issue 3, pages 393-402

Published in Gardens' Bulletin Singapore, in 1966, in volume 21, issue 3, pages 403-423

Published in Gardens' Bulletin Singapore, in 1966, in volume 21, issue 3, pages 425-427