{{umbrella|Notes}}
{{See also|Bibliographical units}}
In general, three types of bibliographical units are distinguished:
#Bibliographically independent publications (monographs)
#Bibliographically semi-independent parts
#Bibliographically dependent parts
Bibliographically independent publications generally contain just one work.
In bibliographically semi-independent publications, two or more works are more or less conjoined. In this category we find the incorporates-structure or the container-structure. The parts are separately signed, separately paginated or foliated and have a separate title page, but they are (usually) announced in the first part. The connection of the parts is derived from this announcement, which may take different forms.
Bibliographically dependent parts occur when other works are added to one work, without the indication of a separate printing for the other works. The continuous pagination and signatures point to the secondary character of the added texts. Such works may be announced on the title page and are sometimes preceded in the publication by a separate title page. If the texts are sufficiently relevant to be mentioned, this can be recorded in a note of the type 'with' (used code: 'wi').
If possible, the information for these 'with' notes is derived from the title page of the dependent part. If no such page exists, the most complete source of information is chosen: either the information on the title page of the whole work referencing this part, or the information at the beginning of the part's text.
*The usual rules are followed for the transcription of the title and author(s).
*If the reference term for the author needs further identification, this may be added between square brackets.
*Further information about secondary authors is not necessarily recorded. If it is sufficiently relevant, this information follows the title, preceded by an editorial statement in English.
*The indication of the place of the part in the whole work is always added between round brackets (parentheses) at the end of the note.
<blockquote>'''''Examples'''''<br>
Note of the type 'with': Petrus Dierkens, Tractaet vande vernietingh, ende verloogheningh sijns selfs (f. F8 recto - I12 recto)<br>
Note of the type 'with': Raymundus Lumbier [= Ramón Lumbier O.Carm.], Het leven van [...] suster Seraphina, Andrea Bonastre, translated by Jacobus a Passione Domini [O.Carm.] (f. E3 recto - H1 verso)</blockquote>
<blockquote>'''''Example (fictitious): dependent part in a multi-volume work'''''<br>
Note of the type 'with': P. Abraham, Het belegh op den christelijcken botherham (3# f. P8 recto - V12 recto)</blockquote>
*If the imprint on the title page of a dependent part contains diverging information, this is mentioned in a general note.
<blockquote>'''''Example'''''<br>
General note: Title page 3# f. P8 recto: 1601</blockquote>