1. Bolus L. (1914–28) Novitates Africanae. ABH 1: 17 (1914), 129, 189–191 (1915); 2: 28–31 (1916); 3: 4–6 (1920); 71–72 (1921); 123–139 (1922), 159–172 (1923); 4: 1–35 (1925); 37–42 (1926); 72–109 (1927); 126–130 (1928)
2. Bolus L. (1928–1935) Notes on Mesembrianthemum and allied genera. NM2: 1–508. 1–16 (9.11.1928), 17–32 (21.12.1928), 33–48 (24.1.1929), 49–64 (12.4.1929), 65–80 (3.5.1929), 81–94 (6.6.1929), 95–110 (4.7.1929), 111–129 (16.8.1929), 130–146 (4.11.1929), 147–160 (22.11.1929: the last two texts end in the middle of a description), 161–176 (20.2.1930), 177–192 (9.5.1930), 193–208 (15.8.1930), 209–224 (12.11.1930), 225–244 (12.2.1931), 245–268 (1.5.1931), 269–292 (3.7.1931), 293–308 (24.9.1931), 309–336 (29.1.1932), 337–356 (24.6.1932), 357–376 (5.12.1932), 377–396 (19.5.1933), 397–416 (16.10.1933), 417–436 (26.1.1934), 437–452 (23.5.1934), 453–472 (17.8.1934), 473–508 (11.2.1935). 517–520 Corrigenda. University of Cape Town. Bolus Herbarium. Cape Town
3. Bolus L. (1936–1958) Notes on Mesembryanthemum and allied genera. NM3: 1–19 (5.2.1936), 21–44 (31.7.1936), 45–78 (14.1.1937), 79–114 (12.8.1937), 115–138 (24.3.1938), 139–188 (20.7.1939), 189–236 (25.8.1950), 237–288 (30.8.1954), 289–417 (30.4.1958). University of Cape Town. Cape Town
4. Bolus, L. 1955 In: Jacobsen H. (1955) Handbuch der sukkulenten Pflanzen 3. Fischer, Jena
5. Bolus L. (1960) Notes on Mesembryanthemum and allied genera. JSAB 27: 47–63 (published 30.12.1960, often cited as 1961)