1. ASAE Standards, 1984a. ASAE D203.4: agricultural machinery management data. In: Hahn, R.H., Purschwitz, M.A., Rosentreter, E.E. (Eds.), ASAE Standards 1984, 32nd ed. ASAE, St. Joseph, MI, pp. 213–220.
2. ASAE Standards, 1984b. ASAE EP391.1: agricultural machinery management. In: Hahn, R.H., Purschwitz, M.A., Rosentreter, E.E. (Eds.), ASAE Standards 1984, 32nd ed. ASAE, St. Joseph, MI, pp. 293–296.
3. ASAE Standards, 1988. ASAE D203.4: agricultural machinery management data. In: Hahn, R.H., Purschwitz, M.A., Rosentreter, E.E. (Eds.), ASAE Standards 1988, 32nd ed. ASAE, St. Joseph, MI, pp. 91–97.
4. ASAE Standards, 1997a. ASAE D497.3: agricultural machinery management data. In: Hahn, R.H., Purschwitz, M.A., Rosentreter, E.E. (Eds.), ASAE Standards 1997, 44th ed. ASAE, St. Joseph, MI, pp. 363–370.
5. ASAE Standards, 1997b. ASAE S313.2: soil cone penetrometer. In: Hahn, R.H., Purschwitz, M.A., Rosentreter, E.E. (Eds.), ASAE Standards 1997, 44th ed. ASAE, St. Joseph, MI, pp. 821–822.