Various systems are currently in use to refer to the subsections of the Old English Martyrology. The system presented on the Fontes Anglo-Saxonici database uses Frank and Cameron's reference no. for the Old English Martyrology (B.19) as a prefix, followed by the numbers which Kotzor assigned to the text's subsections (1, 2, 3 etc.) as suffixes, thus leading to the reference nos. B.19.001, B.19.002, B.19.003 etc..

Frank, R., and A. Cameron, ed., A Plan for the Dictionary of Old English (Toronto, 1973), no. B.19 [Note that Cameron and Frank originally also assigned reference nos. to the various manuscripts of the Old English Martyrology (B.19.1 to B.19.5), although these would now no longer be interpreted as separate texts. For the manuscript listed as B.19.6, see Manuscripts]
Kotzor, G., ed., Das altenglische Martyrologium, 2 vols., Abhandlungen der Bayerischen Akademie der Wissenschaften, phil.-hist. Kl., ns 88.1-2 (Munich, 1981) [a new subdivision of the Old English Martyrology, with brief comments at I, xii, which divides the text into 238 main entries and a smaller number of subsidiary entries. The numbers assigned to these subsections can be found in the titles of the correponding sections in Kotzor's edition, but are also listed here in the Index of Reference Nos., Saints, Feasts, and Manuscript Contents]
Scragg, D. G., ‘Appendix A: Martyrology', Sources of Anglo-Saxon Literary Culture: A Trial Version, ed. F. M. Biggs, T. D. Hill, P. E. Szarmach, Medieval and Renaissance Texts and Studies 74 (Binghamton, 1990), pp. 207-20 [an alternative numbering system, devised for the sourcing project Sources of Anglo-Saxon Literary Culture (SASLC), consisting of the Cameron/Frank prefix and a combination of letters: B19.a, B19.b, B19.c etc.]