ðɪ ˌɔːɹɡɐnᵻzˈeɪʃən dᵻɹˈaɪvz ɪts ˈɪŋkʌm fɹʌmðə sˈeɪl ʌv bˈʊks, tˈiːtʃɚ pɹəfˈɛʃənəl dɪvˈɛləpmənt fˈiːz, kˌɑːntɹɪbjˈuːʃənz, ænd ɡɹˈænts.
The organization derives its income from the sale of books, teacher professional development fees, contributions, and grants.