Zoologiske Samlinger eller Dyrbeskrivelser, tid efter anden forfattede efter egen Betragtning ved Otho Fabricius, fra Aar 1768 og her bragte i Samling fra Aar 1808 [Zoological collections or animal descriptions, from time to time written according to personal reflections by Otho Fabricius, from the year 1768 and here collected from the year 1808]. Det Kongelige Bibliotek, the Royal Danish Library, Copenhagen: "NKS 322 d 4o : Otto Fabricius, Zoologiske Samlinger, 2". Note number 286, Søekoen (den nordlige), [the Sea Cow (the northern one)], Trichechus Manatus (borealis). In: Fabricius O. 1808-(?).1815. http://www5.kb.dk/permalink/2006/manus/778/dan
 This "unpublished note No. 286" is discussed in detail by Hoch (2024: 16-18).