L. Oppenheim, International Law. A Treatise. Volume 2…
“ Neutrality being an attitude of States creating rights and duties, active measures on the part of a neutral state are required for the purpose of preventing its officials and subjects from committing acts incompatible with its duty of impartiality. Now, the manifesto by which a neutral State orders its organs and subjects to comply with the attitude of impartiality adopted by itself is called a declaration of neutrality in the special sense of the term. ”
