1. Alan R. Anderson and Nuel D. Belnap et al., 1975, Entailment: The Logic of Relevance and Necessity, vol. 1, Princeton, xxxii + 542 pp.
2. Alan R. Anderson, Nuel D. Belnap, and J. Michael Dunn et al., 198+, Entailment: The Logic of Relevance and Necessity, vol. 2, Princeton, forthcoming.
3. Nuel D. Belnap, circa 1970, ?Strict Polyadic Combinatory Logics?, unpublished manuscript.
4. Nuel D. Belnap, 1974, ?Functions Which Really Depend on Their Arguments?, unpublished. Presented to a meeting of the Society of Exact Philosophy, University of Alberta, 1974.
5. Aldo Bressan, 1973, A General Interpreted Modal Calculus, Yale University Press.