Kilford, W. K. Elementary air survey (4th ed.).
Chicago Style (17. basım) AtıfKilford, W. K. Elementary Air Survey. 4th ed.
MLA (9th ed.) AtıfKilford, W. K. Elementary Air Survey. 4th ed.
Uyarı: Bu alıntı herzaman %100 doğru olmayabilir..
Kilford, W. K. Elementary air survey (4th ed.).
Chicago Style (17. basım) AtıfKilford, W. K. Elementary Air Survey. 4th ed.
MLA (9th ed.) AtıfKilford, W. K. Elementary Air Survey. 4th ed.