(crybwyll am y tro cyntaf)
Donald C. Watt, ‘When Worlds Collide’, adolygiad o Alternative Paths: Soviets and Americans 1917-1920, gan David W. McFadden, History Today, 44.9 (1994), 56-57 (t. 56).
(crybwyll yn ddiweddarach)
Watt, t. 57
Watt, Donald C., ‘When Worlds Collide’, adolygiad o Alternative Paths: Soviets and Americans 1917-1920, gan David W. McFadden, History Today, 44.9 (1994), 56-57
Donald C. Watt, ‘When Worlds Collide’, adolygiad o Alternative Paths: Soviets and Americans 1917-1920, gan David W. McFadden, History Today, 44.9 (1994), 56-57 (t. 56) <https://search.proquest.com/docview/202810162> [cyrchwyd 23 Mawrth 2024].
Watt, Donald C., ‘When Worlds Collide’, adolygiad o Alternative Paths: Soviets and Americans 1917-1920, gan David W. McFadden, History Today, 44.9 (1994), 56-57 <https://search.proquest.com/docview/202810162 [cyrchwyd 23 Mawrth 2024]