International Association of Microbiological Societies 1969. Proposed procedure for the housing and handling of simians to decrease the transmission of disease to man. Laboratory Animal Handbooks 4, 255-266.

In general, simians should be handled only after they have been anaesthetized or suitably sedated. On no account should a person attempt to handle a simian alone; 2 persons should always be present, one of whom is an experienced handler. ... A suitable method of giving an anaesthetic or sedative to a simian by intraperitoneal or intramuscular injection without the necessity for handling the animal is to restrain the animal by use of the movable partition of the cage.