"The more I study mythology and folklore, the more I come to the same
conclusion that people from every age of this world have come to: myths are the
most precious treasures bequeathed to us by generations long past. -Robin Artisson

Suggested Reading :
Source Material- (this is not an exhaustive list, just a good place to start)

The Eddas – It is imperative for any who are truly interested understanding Norse/Germanic myth and culture and wishes to learn about the gods and goddesses to read the Eddas. 

     a. The Poetic Edda, sometimes referred to as the Elder Edda

     b. The Prose Edda by Snorri Sturlusson often referred to as simply the Younger Edda

Saga of the Volsungs

Beowulf
trans. by Seamus Heaney

The Agricola and the Germania
Tacitus

Contemporary Works

The Anglo-Saxon World
by Nicholas J. Higham and Martin J. Ryan

The Anglo-Saxon Age: A Very Short Introduction
by John Blair

The Anglo-Saxon World: An Anthology (Oxford World's Classics)
by Kevin Crossley-Holland

Travels Through Middle Earth: The Path of a Saxon Pagan
by Alaric Albertsson

The Way of Wyrd
by Brian Bates

The Real Middle Earth: Magic and Mystery in the Dark Ages
by Brian Bates

Looking for the Lost Gods of England
by Kathleen Herbert

Peace-Weavers and Shield-Maidens: Women in Early English Society
by Kathleen Herbert

English Heroic Legends
by Kathleen Herbert

Hammer of the Gods: Anglo-Saxon Paganism in Modern Times
by Swain Wódening

We Are Our Deeds: The Elder Heathenry, Its Ethic and Thew
by Eric Wódening

True Hearth: A Practical Guide to Traditional Householding 
by James Allen Chisholm

Sacred Gifts: Reciprocity and the Gods
by Kirk Thomas

European Paganism
by Ken Dowden

Rites and Religions of the Anglo-Saxons
by Gale Owen

The Mead-Hall: The Feasting Tradition in Anglo-Saxon England
by Stephen Pollington

The Elder Gods: The Otherworld of Early England
by Stephen Pollington

The Cult of Kingship in Anglo-Saxon England
by William A. Chaney

Of Ghosts and Godpoles
by Thorbeorht Linleah 


Runes & Magic

Rudiments of Runelore 
by Stephen Pollington

Wyrdstaves of the North
by Nigel Pennick

Rune Magic: The History and Practice of Ancient Runic Traditions
by Nigel Pennick

Futhark: A Handbook of Rune Magic
by Edred Thorsson

Runelore: A Handbook of Esoteric Runology
by Edred Thorsson

The Book of Seidr: The Native English And Northern European Shamanic Tradition
by Runic John