These are guides to early Christianity that offer introductions to most of the writers of the patristic era (circa 1st-8th centuries), and typically include short biographies, survey of the theological themes of their works and lists of primary and secondary literature. All three patrologies listed below are in the Reference Collection. Drobner's Fathers of the Church is more recent than the other two, and will have the more up-to-date list of critical texts.
Where the text is present in Buswell I will reference the call number and also indicate whether some version of the same text is available in Google Books (GB). All of the volumes from Migne's Patrologia, for example, are now available (but not searchable) online.