Ferrar is also famed for his 10 outstanding textbooks including A textbook of convergence (1938), Algebra: a textbook of determinants, matrices and quadratic forms (1941), and Finite matrices (1951).
Ferrar ay din sikat para sa kanyang 10 natitirang aklat-aralin kasama ang isang aklat ng mga tagpo (1938), algebra: isang aklat-aralin ng determinants, matrices at parisukat forms (1941), at wakas matrices (1951).