Lee, C., C., V., M., L.(1990).Introduction to palnt disease epidemiology / C. Lee Campbell, Laurence V. Madden .:John Wiley n Sons.
Gaya MLA
Campbell, C., Lee., Madden, Laurence, V.."Introduction to palnt disease epidemiology / C. Lee Campbell, Laurence V. Madden".:John Wiley n Sons,1990.Textbook.