APA (7th ed.) Citation

Dykes, W. R., & Dykes, E. K. (1930). Notes on tulip species. H. Jenkins, limited.

Chicago Style (17th ed.) Citation

Dykes, William Rickatson, and Elsie Katherine Dykes. Notes on Tulip Species. London: H. Jenkins, limited, 1930.

MLA (9th ed.) Citation

Dykes, William Rickatson, and Elsie Katherine Dykes. Notes on Tulip Species. H. Jenkins, limited, 1930.