Yes, I completely agree. Do you buy chance have a list of sources to use in order to research more the Hades and Persephone myth?

Yes!
If I had to pick just two to begin with: Hymn to Demeter + Helene Foley’s book on this Hymn. 

The huge list (copied from another post of mine plus some edit).

Greek/Roman sources:

Hymn to DemeterHesiod - Theogony
Orphic HymnsOvid’s Metamorphoses (Book V) and Fasti (Book IV)The Odyssey (Book 10 and 11)Claudian - Rape* of Persephone (means *abduction).Plato’s Cratylus.
Euripides’ Helen and Eumenides.Aristophanes’ Frogs and Thesmophoriazusae.

Others:

HARD, Robin: The Routlege Handbook of Greek Mythology: is a book on general mythology but it has chapters for Hades, Demeter and Persephone and I find it super useful as good myth introduction.FOLEY, Helene; The Homeric Hymn to Demeter: it’s a great book for learning about the Hymn to Demeter, is not hard to read and I think is also available for Scribd suscription if you wanna read online.
CLAY, Politics of Olympus: just one chapter of this book is about the Hymn to Demeter, but is a nice one if you want to complement the previous one.WRIGHT, Dudley; The Eleusinian Mysteries & Rites: a very short and easy to read book about Eleusis cult.
DETIENNE, Marcel; Gardens of Adonis: good for understand myth and greek religious rites connection, and Persephone relation to Thesmophoria and the myth of Mint.SUTER, Ann; The Narcissus and the Pomegranate: this is a feminist scholar that defends Persephone and Hades relationship. Personally I found it a bit difficult to read, but might be easier for English native speakers -I’m not one.KERENYI, Karl; Eleusis: Archetypical Image of Mother and Daughter: this is another nice book that focuses on Persehone’s myth and Eleusis cult.Redfield, James; The Locrian Maidens: this is one of my favs, it studies the cult of Persephone in Locri (South Italy) and other aspects of the myth.Rehm, Rush; Marriage to Death: if you want to learn on the connections between marriage and death in Ancient Greece, it has a chapter on Persephone I think.LEFKOWITZ, Mary R.; Women in Greek Myth:this book is very interesting and the analysis of the myth is focused on having perspectives where women have more agency .STEIN, Charles; Persephone Unveiled: this is more “spiritual” book that studies the myth and thinks of how to apply in personal life.TZANETOU, Angeliki; Finding Persephone: a book about women’s ritualCAMPBELL, Joseph; Goddesses: speaks of many goddesses, but has nice chapters on Persephone and Demeter.FRAZER, Sir James George; Golden Bough: also has nice chapters on Persephone and Demeter. I think it’s free on Kindle.*GRAHAM, M. Marjorie; Archetypal Myth of Demeter & Persephone:A Story for Mother & Daughter Celebrations: this is a very short book, with some illustrations, pretty much inspired in the ideas of “pre-patriarchal” Persephone. It has a story by Charlene Spretnak where Persephone descends to the underworld on her own to take care of the souls *BIBLIOTHECA ALEXANDRINA; Queen of the Sacred Way: this is nice because is an anthology of Persephone related works: poems, short stories, etc.

I also have a list of papers, most available on JSTOR, I’ll post the list later or tomorrow :D