Toolan, D. S. (1991). Nature is a Heraclitean fire: Reflections on cosmology in an ecological age. Seminar on Jesuit Spirituality.
Chicago-viite (17. p.)Toolan, David S. Nature Is a Heraclitean Fire: Reflections on Cosmology in an Ecological Age. St. Louis, MO: Seminar on Jesuit Spirituality, 1991.
MLA-viite (8. p.)Toolan, David S. Nature Is a Heraclitean Fire: Reflections on Cosmology in an Ecological Age. Seminar on Jesuit Spirituality, 1991.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.