Miller, Howard A.
How to know the trees/Howard A. Miller
Wm. C.Brown, 1978
Buku Teks
Lands and peoples : the world in color, volume 6 Canada, The United States
Grolier Incorporated, 1964
Buku Referensi
Peterson, Lee Allen
A field guide to edible wild plants of eastern and Central North America
Houghton Miffiln, 1977
Buku Teks
Borror, Donald J.
A field guide to the insects of America north of Mexico
Houghton Mifflin, 1976
Buku Referensi
Wells, Kenneth McNeill
Colourful Canada
Jarrold & Sons, 1959
Buku Teks