1. Notes on the life history of Panopistus pricei Sinitsin 1931;Krull;Proc. Helm. Soc. Wash.,1934
2. Studien über die Phylogenie der Trematoden
3. Egg albumen as a mounting medium in the study of living helminths;Krull;Proc. Helm. Soc. Wash.,1934
4. Some observations on the life history of Brachylaemus virginiana (Dickerson) Krull, n. comb;Krull;Trans. Amer. Micr. Soc.,1934
5. Studien über die Phylogenie der Trematoden. IV. The life histories of Plagioporus siliculus and Plagioporus virens, with special reference to the origin of Digenea;Sinitsin;Z. f. wiss. Zool.,1931