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Hitchcock, A.S. (1921), „The Type Concept in Systematic Botany”, American Journal of Botany8 (5): 251–255, DOI:10.2307/2434993, JSTOR2434993
Frey, Jennifer K.; Yates, Terry L.; Duszynski, Donald W.; Gannon, William L.; Gardner, Scott L. (1992). „Designation and Curatorial Management of Type Host Specimens (Symbiotypes) for New Parasite Species”. The Journal of Parasitology78 (5): 930–993. DOI:10.2307/3283335. JSTOR3283335.
Frey, Jennifer K.; Yates, Terry L.; Duszynski, Donald W.; Gannon, William L.; Gardner, Scott L. (1992). „Designation and Curatorial Management of Type Host Specimens (Symbiotypes) for New Parasite Species”. The Journal of Parasitology78 (5): 930–993. DOI:10.2307/3283335. JSTOR3283335.
Hansen, Hans V.; Seberg, Ole (1984). „Paralectotype, a new type term in botany”. Taxon33 (4): 707–711. DOI:10.2307/1220790. JSTOR1220790.
Hitchcock, A.S. (1921), „The Type Concept in Systematic Botany”, American Journal of Botany8 (5): 251–255, DOI:10.2307/2434993, JSTOR2434993
Frey, Jennifer K.; Yates, Terry L.; Duszynski, Donald W.; Gannon, William L.; Gardner, Scott L. (1992). „Designation and Curatorial Management of Type Host Specimens (Symbiotypes) for New Parasite Species”. The Journal of Parasitology78 (5): 930–993. DOI:10.2307/3283335. JSTOR3283335.
Frey, Jennifer K.; Yates, Terry L.; Duszynski, Donald W.; Gannon, William L.; Gardner, Scott L. (1992). „Designation and Curatorial Management of Type Host Specimens (Symbiotypes) for New Parasite Species”. The Journal of Parasitology78 (5): 930–993. DOI:10.2307/3283335. JSTOR3283335.
Hansen, Hans V.; Seberg, Ole (1984). „Paralectotype, a new type term in botany”. Taxon33 (4): 707–711. DOI:10.2307/1220790. JSTOR1220790.