This template lists books related to the specified subject, with given status and using given manner of listing.
subject— the name of the subject. No
show all— specifies whether to list books in descendant subjects as well as in this subject; blank lists only those in this subject;
splitlists first books in this subject, then books in descendants; any other non-blank value lists books in this subject and descendants as a single undifferentiated list.
cat— a category that books must belong to in order to be listed; if used, presumably some child of Category:Books by completion status.
not— a category that books must not belong to, in order to be listed; if used, presumably Category:Books by completion status/all books.
namespace— a namespace books must belong to in order to be listed.
only, indicating that books shouldn't be listed unless they have a sighted version, or blank indicating that books should be listed regardless of whether they have a sighted version.