Safari of discovery; the universe of Albert Schweitzer,

Mode of access: Internet.

The mind and the universe; a contribution to the story of the expanding universe of the human mind.

Mode of access: Internet.

The science of discourse;

Mode of access: Internet.

The art of discourse: a system of rhetoric,

Mode of access: Internet.

The art of discourse: a system of rhetoric adapted for use in colleges and academies,

Mode of access: Internet.

Elements of the art of rhetoric : adapted for use in colleges and academies, and also, for private study /

Later published under the title: The art of discourse.