Hector-Neri Castañeda. Imperative reasonings. Philosophy and phenomenological research, vol. 21 no. 1 (1960), pp. 21–49. - B. A. O. Williams. Imperative inference. I. Analysis (Oxford), vol. 23 suppl. (1963), pp. 30–36. - P. T. Geach. Imperative inference. II. Analysis (Oxford), vol. 23 suppl. (1963), pp. 37–42. - Nicholas Rescher and John Robison. Can one infer commands from commands?Analysis (Oxford), vol. 24 no. 5 (1964), pp. 176–179. - André Gombay. Imperative inference and disjunction. Analysis (Oxford), vol. 25 no. 3 (1965), pp. 58–62. - Lennart Åqvist. Choice-offering and alternative-presenting disjunctive commands. Analysis (Oxford), no. 5 (1965), pp. 182–184. - A. J. Kenny. Practical inference. Analysis (Oxford), vol. 26 no. 3 (1966), pp. 65–75. - P. T. Geach. Dr. Kenny on practical inference. Analysis (Oxford), vol. 26 no. 3 (1966), pp. 76–79. - Yehoshua Bar-Hillel. Imperative inference. Analysis (Oxford), vol. 26 no. 3 (1966), pp. 79–82. - André Gombay. What is imperative inference?Analysis (Oxford), vol. 27 no. 5 (1967), pp. 145–152. - R. M. Hare. Some alleged differences between imperatives and indicatives. Mind, n.s. vol. 76 (1967), pp. 309–326. - Alfred F. MacKay. Inferential validity and imperative inference rules. Analysis (Oxford), vol. 29 no. 5 (1969), pp. 145–156.