Tennessee state symbols : the fascinating stories behind our flag and capitol6 the mockingbird6 iris and other official emblems / Rob Simbeck. - Nashville : Altheus Press, 1995. - 176 p. : ill. ; 22 cm.см.. - ბიბლიოგრ.: გვ. 145-153. - ISBN 0-9642991-8-6[MFN: 124940]
The earth as a cradle for life / Frank D. Stacey, Jane H. Hodgkinson. - New Jersey : World Scientific, 2013. - xvii, 285 p. : ill. ; 24 cm.см.. - ბიბლიოგრ. და სახ. საძიებელი: გვ. 253-285. - ISBN 978-981-4508-32-2[MFN: 124985]