1. Akers, L.E. (1966). Particle Board & Hardboard. London: Pergamon Press.
2. Allen, P.G. (1968). N.A.A.S. Q. Rev., 80, 167–174.
3. Allerton, F.W. (1968). Tomatoes for Everyone. pp. 71–80. London: Faber & Faber.
4. Anon. (ca. 1877). Chemistry, Theoretical Practical & Analytical as Applied to Arts & Manufactures, VII, pp. 513–542. London: W. Mackenzie.
5. Anon. (1964). Rept. Lee Valley, Expl. Hort. Sta., 18–23.