Walpers Annales Botanices Systematicae. Tomus VII. Addenda ad litteraturam botanicam annorum 1856-1866. - Müller, Karl (Johann Karl August Friedrich Wilhelm), 1818 1899; Walpers, Wilhelm Gerhard, 1816-1853 (Lipsiae : Sumptibus Ambrosii Abel, 1868)
J.S. Wassermann