Use a deductive (top-down) writing style.
Citation styles follow the American Society of Horticultural Science style manual
BOOK
Hartmann, H.T., D.E. Kester, and F.T. Davies, Jr. 1990. Plant propagation principles and practices. 5th ed. Prentice Hall, Englewood Cliffs, N.J.
BOOK CHAPTER
Brown, A.G. 1995. Apples, p. 3-37. In: J. Janick and J.N. Moore (eds.). Advances in fruit breeding. Purdue Univ. Press, West Lafayette, Ind.
BULLETIN
Rollins, H.A., F.S. Howlett, and E.H. Emmert. 2002. Factors affecting apple hardiness and methods of measuring resistance of tissue to low temperature injury. Mich. Agr. Expt. Sta. Res. Bul. 901.
PERIODICAL
Goldberg, D., B. Cornat, and Y. Bar. 1991. The distribution of roots, water, and minerals as a result of trickle irrigation. J. Amer. Soc. Hort. Sci. 96:645-648.
PROCEEDINGS
American Society for Horticultural Science. Tropical Region. 2000. Proc. XVIII Annu. Mtg., Miami, 25-30 Oct. 2000. (Proc. Trop. Reg. Amer. Soc. Hort. Sci. 14).
PROCEEDINGS PAPER
Locascio, S.J., J.G.A. Fiskell, and P.E. Everett. 2000. Advances in watermelon fertility. Proc. Trop. Reg. Amer. Soc. Hort. Sci. 14:223-231.
REPORTS
U.S. Department of Agriculture. 1997. Agricultural statistics for 1996. U.S. Dept. Agr., Washington, D.C.