1. The development and growth of the layers of the blastoderm;Balfour;Quart. J. Micros. Sci,1873
2. An Introduction to Embryology;Balinsky,1970
3. Developmental Processes in Higher Vertebrates;Bellairs,1971
4. Early stages of cleavage in the chick embryo;Bekhtina;Arkiv. Anat. Gistol. Embryol,1960
5. The early development of the pigeon's egg with especial reference to polyspermy and the origin of the periblast nuclei;Blount;J. Morph,1909