Cromwell, A. D., & Davis, K. C. (1915). Agriculture and life: A text-book for normal schools and teachers' reading circles. J.B. Lippincott company.
Lua i Stíl Chicago (17ú heag.)Cromwell, Arthur D., agus Kary Cadmus Davis. Agriculture and Life: A Text-book for Normal Schools and Teachers' Reading Circles. Philadelphia, London: J.B. Lippincott company, 1915.
Lua MLA (8ú heag.)Cromwell, Arthur D., agus Kary Cadmus Davis. Agriculture and Life: A Text-book for Normal Schools and Teachers' Reading Circles. J.B. Lippincott company, 1915.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.