By St. Gregory Palamas : Calling everything near Him (bilingual – Greek / English – excerpts from Speeches 4, 7, 9, 16 and 29, selected and translated by Elpenor) 

Cf. Gregory Palamas @ Amazon

Gregory Palamas extensive Anthology (in the Greek Original, without translation)

Unceasing Prayer links , St. Gregory Palamas, On Unceasing Prayer 

10 Catechetical Orations by Gregory Palamas (in Greek original, pdf)

St. Gregory Palamas, A Homily on the Dormition of Theotokos 

St. Gregory Palamas, On the Holy Icons