APA
Timothy H., . (1956). Development and spread of improved maize varieties and hybrids developing countries. Washington DC: Bureau for science.
Chicago
Timothy H.D, . 1956. Development and spread of improved maize varieties and hybrids developing countries. Washington DC: Bureau for science.
Harvard
Timothy H., . (1956). Development and spread of improved maize varieties and hybrids developing countries. Washington DC: Bureau for science.
MLA
Timothy H.D, . Development and spread of improved maize varieties and hybrids developing countries. Washington DC: Bureau for science. 1956.