Don’t Abbreviate Page Numbers with "f." or "ff."
Do not abbreviate page ranges with "f." or "ff." Instead, always give the entire page range, e.g. 40-41 or 110-112. Your selected citation style will ensure that these are abbreviated with "f." or "ff." as appropriate.
Why is this? If you type in the letters "f." or "ff." Citavi will no longer recognize this as page number data. Accordingly, it will be prevented from using your citation style of choice to display page numbers correctly (e.g. preceded by "p.").