1902 wholesale trade price-list of high-class bulbs : for forcing and for outdoor planting for wholesale trade only - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (J.M. Thorburn & Co, 1902)

1912 Marshall's bulbs : for fall planting - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (W.E. Marshall & Co, 1912)

1913 midsummer catalogue - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Fottler, Fiske, Rawson Co, 1913)

1914 midsummer catalogue - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Fottler, Fiske, Rawson Co, 1914)

1914 Thorburn's seeds - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (J.M. Thorburn & Co, 1914)

1915 fall bulb list - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (W.E. Marshall & Co, 1915)

1916 fall bulbs - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (W.E. Marshall & Co, 1916)

1916 Thorburn's price list : pot grown strawberry plants ready June 15th - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (J.M. Thorburn & Co, 1916)

1917 spring garden guide - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Arthur T. Boddington Co. Incorporated, 1917)

1997 IUCN red list of threatened plants (1997)

Albert Schenkel, Samen : 1935 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Albert Schenkel, 1935)

The amateur's practical garden-book - Bailey, L. H. (Liberty Hyde), 1858 -1954 (The Macmillan company, 1900)

American agriculturist (Orange Judd Co., Publishers [etc.], 1883)

American bulb company bulbs : rare flower roots, plants, seeds and garden requisites - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (American Bulb Company, 1897)

The American florist : a weekly journal for the trade - American Florists Company. (American Florist Company, 1886)

The American florist : a weekly journal for the trade - American Florists Company. (American Florist Company, 1887)

The American florist : a weekly journal for the trade - American Florists Company. (American Florist Company, 1888)

The American florist : a weekly journal for the trade - American Florists Company. (American Florist Company, 1889)

The American florist : a weekly journal for the trade - American Florists Company. (American Florist Company, 1890)

The American florist : a weekly journal for the trade - American Florists Company. (American Florist Company, 1891)

The American florist : a weekly journal for the trade - American Florists Company. (American Florist Company, 1892)