| Base Numbers | |
| Iranian literatures | 891.5 |
| Old Persian (West Iranian) | 891.51 |
| Avestan (East Iranian) | 891.52 |
| Middle Iranian literatures--Pahlavi (Middle Persian), Sogdian, Khotanese (Saka) | 891.53 |
| Armenian (Do not use 891.992) | 891.54 |
| Modern Persian (Farsi) | 891.55 |
| Afghan (Do not use 891.59) | 891.58 |
| Other modern Iranian literatures--Kurdish, Baluchi, Tajiki, Ossetic, Pamir (Galcha), Yaghnobi | 891.59 |
For Works by or about an individual author, the citation order is to first class together all the works by or about an author using the Base Numbers table followed by a cutter and workmark.
For works by or about more than one author, add to the base number for the particular literature:
| Collections in more than one form | add -08 |
| Criticism of more than one form | add -09 |
For works by or about more than one author in specific forms, add to the base number for the for the particular literature:
| Collections of Poetry | add -081 |
| Criticism and Interpretation of Poetry | add -091 |
| Collections of Drama | add -082 |
| Criticism and Interpretation of Drama | add -092 |
| Collections of Fiction | add -083 |
| Criticism and Interpretation of Fiction | add -093 |
Example
| Great Works of Farsi Poetry compiled by Shiraz | 891.55081 G88 |
BUT:
| The Poetry of Armenia compiled by Dolan | 891.5408 P68 |