A demon named Skyler tries to sell the Books of Ascension to Buffy and Faith in Enemies. He says they are, “very powerful works and I’m not talking about the prose. They deal with some dark stuff. And the Mayor would hate for somebody to get ahold before he… well …

Darkest Magick was a book from which Willow got the magical power to attack Glory in Tough Love.

Giles gave Buffy Lucious Temple’s diary to research the First Evil in Amends. Lucious Temple was an acolyte of Acathla and an expert on demons. He was also a keen gardener.

Giles mentions his book Exploring Demon Dimensions in Beauty and the Beasts.

Giles performed a binding spell on the creature which emerged from the Hellmouth in The Zeppo. Willow says he got the spell from the magical book Hebron’s Almanac. We also hear reference to The Books of Pherion.

Hell’s Offspring is a demon-related book belonging to Giles. Joyce spotted it in Bad Eggs, when she looked for Buffy in the library.

In her spell on Glory in Tough Love, Willow says, “Kali, Hera, Kronos, Tonic. Air like nectar, thick as onyx. Cassiel by your second star, hold my victim as in tar!” Kali is the Hindu goddess of destruction and death, Hera is the Queen of the Greek gods and wife …

In Revelations, Gwendolyn Post mentions several important texts which Giles does not have, including Hume’s Paranormal Encyclopaedia.

Giles asks Xander to look through the Kippler volum

In Revelations, Gwendolyn Post said Giles did not have the book Labyrinth Maps of Malta in his library.

Giles mentions the book Malleus Maleficarum in The Pack, saying it deals with demonic possession. The book is real. It was written by Heinrich Kramer and James Sprenger, in the late 15th century and acted as a kind of manual for witch hunters. It contained information on how to recognise …

Giles kept the book The Marenschadt Text hidden on the top shelf of his filing cabinet. In Enemies, Willow said it contained a section on genocide that dealt with Ascension. It also had a reference to the last entry of the journal of Desmond Kane, pastor of Sharpsville. The town …

Giles mentions his book Mystery of Acathla in Beauty and the Beasts.

Angel met Giles for the first time in Out of Mind, Out of Sight (”A vampire in love with a Slayer. It’s rather poetic, in a maudlin sort of way.”) and revealed to the Watcher that he could get copies of the Tiberius Manifesto and the Pergamum Codex, which are …

The Book of Tarnis was the source from which Giles got information on the Monks of Dagon and Glory. It was written by Tarnis, who founded the Monks of Dagon in the twelfth century.