Não informado. (1956). Journal of the Rio Grande Valley Horticultural Society. Rio Grande Valley Horticultural Society.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Journal of the Rio Grande Valley Horticultural Society. Weslaco, Tex: Rio Grande Valley Horticultural Society, 1956.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Journal of the Rio Grande Valley Horticultural Society. Rio Grande Valley Horticultural Society, 1956.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.