Coba jelasin Daftar pustaka dari Bija dong

Khanna, Madhu (2003). Yantra: The Tantric Symbol of Cosmic Unity.  Inner Traditions. ISBN 0-89281-132-3 & ISBN 978-0-89281-132-8.

Lingpa, Dudjom; Tulku, Chagdud; Norbu, Padma Drimed; Barron, Richard (Lama Chökyi Nyima, translator); Fairclough, Susanne (translator) (1994, 2002 revised). Buddhahood without meditation: a visionary account known as 'Refining one's perception' (Nang-jang) (English; Tibetan: ran bźin rdzogs pa chen po'i ranźal mnon du byed pa'i gdams pa zab gsan sñin po). Revised Edition. Junction City, CA, USA: Padma Publishing. ISBN 1-881847-33-0