"PHYSICO-CHEMICAL COMPOSITION OF EARLY AND LATE HARVESTED IMPROVED AND LOCAL SWEET POTATO (Ipomoea Batatas (L) Lam) CULTIVARS ON THE JOS PLATEAU". FULafia Journal of Science and Technology , م 4, عدد 2, ديسمبر، 2018, ص 102-9, https://lafiascijournals.org.ng/index.php/fjst/article/view/247.