The discovery of open access books is challenging due to issues with metadata, pricing models, and rights information. Metadata standards like ONIX and CrossRef guidelines can help, along with supplying metadata to discovery services. The Directory of Open Access Books (DOAB) is a key discovery service that reviews publishers and lists their open access book metadata, helping increase downloads by 60%. For open access books to be discoverable in library catalogs, publishers should submit metadata to DOAB and libraries should systematically include DOAB records.