Não informado. (1957). Belmontia: Miscellaneous publications in botany. Agricultural University, Laboratory of Plant Taxonomy and Geography.
Citação do estilo Chicago (17ª ed.)Não informado. Belmontia: Miscellaneous Publications in Botany. Wageningen, Holanda: Agricultural University, Laboratory of Plant Taxonomy and Geography, 1957.
Citação MLA (8ª ed.)Não informado. Belmontia: Miscellaneous Publications in Botany. Agricultural University, Laboratory of Plant Taxonomy and Geography, 1957.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.