"On Theosophy" by H. S. Olcott - Compiled by S. B. Dougherty, from speeches collected in Theosophy, Religion and Occult Science (1885), and from Theosophical Siftings, vol. 4, no. 10 (1891)..
The Vampire, by H.S.Olcott - Adyar Pamphlet No. 112. "it is most evident that too much care cannot be taken to ascertain beyond doubt the actual and complete death of a person before committing the body to the grave.".