- Page, R. E., and M. A. Willis. 1983. Sexual dimorphism in ventral abdominal setae in Scolytus multistriatus (Coleoptera: Scolytidae): possible role in courtship behavior . Entomological Society of America, Annals 76:78-82.
- Thomas, H. E., W. G. Willis, and R. A. Keen. 1978. Controlling Dutch elm disease. Kansas State University, Agricultural Experiment Station, Bulletin 626. 16 p.
- Thompson, H. E., W. G. Willis, and R. A. Keen. 1978. Controlling Dutch elm disease. Kansas State University Agricultural Experiment Station, Bulletin 626. 16 p.
- Willis, N. P., and E. Hodgson. 1970. Phospholipids and their constituent fatty acids in two populations of Dendroctonus frontalis (Coleoptera: Scolytidae) . Entomological Society of America, Annals 63:1585-1591.
- Willis, W. C., C. L. Kramer, and H. E. Thompson. 1963. Dutch elm disease in Kansas in 1962 . Plant Disease Reporter 47:443.
- Willis, W. C., C. L. Kramer, and H. E. Thompson. 1964. Dutch elm disease in Kansas in 1963 . Plant Disease Reporter 48:324.
- Willis, W. C., C. L. Kramer, and H. E. Thompson. 1965. Dutch elm disease in Kansas in 1964 . Plant Disease Reporter 49:359.
- Wysong, D. S., and W. G. Willis. 1968. Recorded distribution of Dutch elm disease west of the Mississippi River as of 1967 . Plant Disease Reporter 52:652-653.