Snijder، E. J.؛ Horzinek، M. C. (1 نوفمبر 1993). "Toroviruses: replication, evolution and comparison with other members of the coronavirus-like superfamily". Journal of General Virology. Microbiology Society. ج. 74 ع. 11: 2305–2316. DOI:10.1099/0022-1317-74-11-2305. ISSN:0022-1317.
Snijder، E. J.؛ Horzinek، M. C. (1 نوفمبر 1993). "Toroviruses: replication, evolution and comparison with other members of the coronavirus-like superfamily". Journal of General Virology. Microbiology Society. ج. 74 ع. 11: 2305–2316. DOI:10.1099/0022-1317-74-11-2305. ISSN:0022-1317.