Philippines. Department of Public Works, Transportation and Communications. Planning and Project Development Office. PPDO geographical coding scheme. [s.n.
Цитирование в стиле Чикаго (17-е изд.)Philippines. Department of Public Works, Transportation and Communications. Planning and Project Development Office. PPDO Geographical Coding Scheme. Manila: [s.n.
Цитирование MLA (9-е изд.)Philippines. Department of Public Works, Transportation and Communications. Planning and Project Development Office. PPDO Geographical Coding Scheme. [s.n.
Предупреждение: эти цитированмия не могут быть всегда правильны на 100%.