general editor Nguyen Manh Hung ; material development specialist Do Dien Nhi ; consultants Nguyen Ngoc Bich ... [and others] ; translators Sitthanary Kim (Khmer), Voradeth Ditthavong (Lao) ; graphic artist Ho Dac Ngoc
general editor Nguyen Manh Hung ; material development specialist Do Dien Nhi ; consultants Nguyen Ngoc Bich ... [and others] ; translators Sitthanary Kim (Khmer), Voradeth Ditthavong (Lao) ; graphic artist Ho Dac Ngoc