Sumner Carnahan, with Lama Kunga Rinpoche, Ngor Thartse Shabtrung ; foreword by Lobsang Lhalungpa ; introduction by Robert A.F. Thurman ; letters from His Holiness the Dalai Lama and from Thubten J. NorbuClear Light Publishersc1995
Helmut Hoffman[n] in collaboration with Stanley Frye, Thubten J. Norbu, Ho-chin YangPublished for the Asian Studies Research Institute by the Research Center for the Language Sciences, Indiana University[1975]