-- Database schema
| Country : CountryCode [ TEXT ] primary_key , ShortName [ TEXT ] , TableName [ TEXT ] , LongName [ TEXT ] , Alpha2Code [ TEXT ] , CurrencyUnit [ TEXT ] , SpecialNotes [ TEXT ] , Region [ TEXT ] , IncomeGroup [ TEXT ] , Wb2Code [ TEXT ] , NationalAccountsBaseYear [ TEXT ] , NationalAccountsReferenceYear [ TEXT ] , SnaPriceValuation [ TEXT ] , LendingCategory [ TEXT ] , OtherGroups [ TEXT ] , SystemOfNationalAccounts [ TEXT ] , AlternativeConversionFactor [ TEXT ] , PppSurveyYear [ TEXT ] , BalanceOfPaymentsManualInUse [ TEXT ] , ExternalDebtReportingStatus [ TEXT ] , SystemOfTrade [ TEXT ] , GovernmentAccountingConcept [ TEXT ] , ImfDataDisseminationStandard [ TEXT ] , LatestPopulationCensus [ TEXT ] , LatestHouseholdSurvey [ TEXT ] , SourceOfMostRecentIncomeAndExpenditureData [ TEXT ] , VitalRegistrationComplete [ TEXT ] , LatestAgriculturalCensus [ TEXT ] , LatestIndustrialData [ INTEGER ] , LatestTradeData [ INTEGER ] , LatestWaterWithdrawalData [ INTEGER ] | Series : SeriesCode [ TEXT ] primary_key , Topic [ TEXT ] , IndicatorName [ TEXT ] , ShortDefinition [ TEXT ] , LongDefinition [ TEXT ] , UnitOfMeasure [ TEXT ] , Periodicity [ TEXT ] , BasePeriod [ TEXT ] , OtherNotes [ INTEGER ] , AggregationMethod [ TEXT ] , LimitationsAndExceptions [ TEXT ] , NotesFromOriginalSource [ TEXT ] , GeneralComments [ TEXT ] , Source [ TEXT ] , StatisticalConceptAndMethodology [ TEXT ] , DevelopmentRelevance [ TEXT ] , RelatedSourceLinks [ TEXT ] , OtherWebLinks [ INTEGER ] , RelatedIndicators [ INTEGER ] , LicenseType [ TEXT ] | CountryNotes : Countrycode [ TEXT ] CountryNotes.Countrycode = Country.CountryCode , Seriescode [ TEXT ] CountryNotes.Seriescode = Series.SeriesCode , Description [ TEXT ] | Footnotes : Countrycode [ TEXT ] Footnotes.Countrycode = Country.CountryCode , Seriescode [ TEXT ] Footnotes.Seriescode = Series.SeriesCode , Year [ TEXT ] , Description [ TEXT ] | Indicators : CountryName [ TEXT ] , CountryCode [ TEXT ] Indicators.CountryCode = Country.CountryCode , IndicatorName [ TEXT ] , IndicatorCode [ TEXT ] , Year [ INTEGER ] , Value [ INTEGER ] | SeriesNotes : Seriescode [ TEXT ] SeriesNotes.Seriescode = Series.SeriesCode , Year [ TEXT ] , Description [ TEXT ] |
-- -- What are the sources for the data of children who finished primary school education in North American countries?

SELECT DISTINCT T3.Description FROM Country AS T1 INNER JOIN Indicators AS T2 ON T1.CountryCode = T2.CountryCode INNER JOIN CountryNotes AS T3 ON T2.CountryCode = T3.Countrycode WHERE T1.Region = 'North America' AND T2.IndicatorName = 'Out-of-school children of primary school age, both sexes (number)';