| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Directory of Plants 1958-2001: Distributed by International Succulent Introductions with Alphabetical Index | 978-0-9534004-1-6 (0-9534004-1-7) | 2001 |
| New Haworthia Species/ Combinations Published Subsequent to 'Haworthia Revisited': Pt. 1 | 978-0-9534004-8-5 (0-9534004-8-4) | 2004 |
H. M. · Harrie Massie · Harro Maas · Harro Muus · Harro Muuss · Harry Mac · Harry Massey · Harry Max · Harry McGee · Harry Meigh · Harry Mika · Harry Mucksch · Hiro Miyakawa · Hiroe Miyaoka · Horia Moasa