Douglas, A. E. (2010). The symbiotic habit. Princeton Univ. Press.
Lua i Stíl Chicago (17ú heag.)Douglas, Angela E. The Symbiotic Habit. Princeton, N.J. [u.a.]: Princeton Univ. Press, 2010.
Lua MLA (8ú heag.)Douglas, Angela E. The Symbiotic Habit. Princeton Univ. Press, 2010.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.