Spencer, A. G. (1889). Gratitude and trust ..
Lua i Stíl Chicago (17ú heag.)Spencer, Anna Garlin. Gratitude and Trust .. [Providence, R.I, 1889.
Lua MLA (8ú heag.)Spencer, Anna Garlin. Gratitude and Trust .. 1889.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.