Não informado. (1969). Progressive Horticulture. Hill Horticulture Development Board, Horticultural Experiments and Training.
Chicago-Zitierstil (17. Ausg.)Não informado. Progressive Horticulture. Chaubattia, India: Hill Horticulture Development Board, Horticultural Experiments and Training, 1969.
MLA-Zitierstil (8. Ausg.)Não informado. Progressive Horticulture. Hill Horticulture Development Board, Horticultural Experiments and Training, 1969.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.