Gāyatrī, the Highest Meditation

Within its intended audience — practitioners of Vedic spirituality or students of comparative religion — this is a thorough, authoritative, and well-published guide to the Gayatri Mantra by a respected teacher in that tradition. The publisher (Motilal Banarsidass) is a genuine academic-religious press, which adds credibility. But the audience is genuinely narrow, the content is devotionally Hindu in a way that doesn't translate across faith traditions, and readers outside that context will find little accessible ground.