Published in Gardens' Bulletin. Singapore, in 1961, in volume 18, pages 83-97

Published in Gardens' Bulletin, Singapore, in 1961, in volume 18, issue 2, pages 71-75

Published in Gardens' Bulletin, Singapore, in 1961, in volume 18, issue 2, pages 76-82

Published in Gardens' Bulletin, Singapore, in 1961, in volume 18, issue 3, pages 98-101

Published in Gardens' Bulletin, Singapore, in 1961, in volume 18, issue 3, pages 102-327

Published in Gardens' Bulletin, Singapore, in 1961, in volume 18, issue 3, pages 328-329

Published in Gardens' Bulletin, Singapore, in 1961, in volume 18, issue 3, pages 330-332